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How to correct "disable Autorun registry key" enforcement in Windows
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SUMMARY
MORE INFORMATION
The purpose of Autorun
Prerequisites to disable Autorun capabilities
How to use Group Policy settings to disable all Autorun features
How to selectively disable specific Autorun features
Registry key that is used to control the behavior of the current update
How to set the HonorAutorunSetting registry key manually
WORKAROUND
Workaround 1: To prevent creating Autorun.inf files on shares
Workaround 2: To disable the use of USB storage devices
Article ID
: 953252
Last Review : August 21, 2008
Revision
: 2.0
SUMMARY
The registry key guidance that is offered in Technet article 91525 did not correctly disable AutoRun features. After you set the
registry keys to disable these features as described in this Technet article, the AutoRun capabilities, the Double Click feature, and
the Contextual Menu feature continue to function as if they were not set. This article describes how to obtain updates that correct
these registry key settings.
This article is applicable for all supported editions of the following products:
Microsoft Windows 2000
Windows XP Service Pack 2
Windows Server 2003 Service Pack 1
Windows Server 2003 Service Pack 2
Windows Vista
Windows Server 2008 is not affected.
Back to the top
MORE INFORMATION
The purpose of Autorun
The main purpose of Autorun is to provide a software response to hardware actions that you start on a computer. Autorun has the
following features:
• Double Click
• Contextual Menu
• AutoPlay
These features are typically called from removable media or from network shares. During AutoPlay, the Autorun.inf file from the
media is parsed. This file specifies which commands the system runs. Many companies use this functionality to start their installers.
Back to the top
Prerequisites to disable Autorun capabilities
To disable Autorun capabilities, you must install the following updates:
• Security Update for Windows XP (KB950582)
http://www.microsoft.com/downloads/details.aspx?FamilyId=CC4FB38C-579B-40F7-89C4-1721D7B8DAA5
• Security Update for Windows Server 2003 for Itanium-based Systems (KB950582)
http://www.microsoft.com/downloads/details.aspx?FamilyId=5795F63E-1FD9-4A13-9650-1015E14B6D11
• Security Update for Windows Server 2003 x64 Edition (KB950582)
http://www.microsoft.com/downloads/details.aspx?FamilyId=E8507286-CDF8-4BCB-AFC5-9734FE772C53
• Security Update for Windows Server 2003 (KB950582)
http://www.microsoft.com/downloads/details.aspx?FamilyId=705305E5-7060-4236-B5D2-40CA63A967FB
• Security Update for Windows XP x64 Edition (KB950582)
http://www.microsoft.com/downloads/details.aspx?FamilyId=21A0124C-6F50-4281-923E-E2B28068147A
• Security Update for Windows 2000 (KB950582)
http://www.microsoft.com/downloads/details.aspx?FamilyId=C192EDCF-CA3D-44E3-8ECC-49C5F4DA5405
http://support.microsoft.com/kb/953252/en-us[8/27/2008 10:05:25 AM]
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How to correct "disable Autorun registry key" enforcement in Windows
Note Windows Vista-based systems must have security update 950582 (Security bulletin MS08-038) installed to take advantage of
the registry key settings that disable Autorun.
As soon as the prerequisites are installed, follow these steps to disable Autorun.
Back to the top
How to use Group Policy settings to disable all Autorun features
Windows Vista
1.
Click Start
, type Gpedit.msc in the Start Search box, and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
Under Computer Configuration, expand Administrative Settings, expand Windows Components, and then click
Autoplay Policies.
2.
3.
In the Details pane, double-click Turn off Autoplay.
4.
Click Enabled, and then select All drives in the Turn off Autoplay on box to disable Autorun on all drives.
5.
Restart the computer.
Windows Server 2003, Windows XP, and Windows Server 2000
1.
Click Start, click Run, type Gpedit.msc in the Open box, and then click OK.
2.
Under Computer Configuration, expand Administrative Templates, and then click System.
3.
In the Settings pane, right-click Turn off Autoplay, and then click Properties.
4.
Click Enabled, and then select All drives in the Turn off Autoplay box to disable Autorun on all drives.
Note In Windows 2000, the policy setting is named Disable Autoplay.
5.
Click OK to close the Turn off Autoplay Properties dialog box.
6.
Restart the computer.
Back to the top
How to selectively disable specific Autorun features
To selectively disable specific Autorun features, you must modify the NoDriveTypeAutoRun value under the following registry key
subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
How you modify this subkey depends on the Autorun feature that you want to disable. For more information about Autorun registry
key values, visit the following Microsoft TechNet Web page:
http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/regentry/91525.mspx?mfr=true
Autorun is also known as AutoPlay. The following table shows the settings for the NoDriveTypeAutoRun registry value.
Value
Meaning
0x1
Disables AutoPlay on drives of unknown type
0x4
Disables AutoPlay on removable drives
0x8
Disables AutoPlay on fixed drives
0x10
Disables AutoPlay on network drives
0x20
Disables AutoPlay on CD-ROM drives
0x40
Disables AutoPlay on RAM disks
0x80
Disables AutoPlay on drives of unknown type
0xFF
Disables AutoPlay on all kinds of drives
The default value for NoDriveTypeAutoRun varies for different Windows-based operating systems. These default values are listed
in the following table.
Operating system
Default value
Windows Vista
0x91
Windows Server 2003
0x95
Windows XP
0x91
Windows 2000
0x95
Back to the top
Registry key that is used to control the behavior of the current update
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might
occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back
up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to
back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
All the fixes in the current update for Windows XP and for Windows Server 2003 have been included in the following two registry
subkeys.
http://support.microsoft.com/kb/953252/en-us[8/27/2008 10:05:25 AM]
How to correct "disable Autorun registry key" enforcement in Windows
Note Values were concentrated in these subkeys so that you can revert to the previous configuration if it is required. Windows
Server 2000 and Windows Vista do not use these registry subkeys.
HonorAutorunSetting registry subkeys
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
• HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
Registry Value
Value
Data type
Range
Default value
HonorAutorunSetting
REG_DWORD
0x0–0xFF
0x01
When you install update 950582, the HonorAutorunSetting registry key is created only in the HKEY_LOCAL_MACHINE registry hive.
The registry key has a default value of 0x1. This value enables the functionality that is present in the current update. Before you
install the current update, this registry key is not present in the system. You can obtain prepackage installation Autorun behavior by
manually setting the registry key to 0. (To do this, type 0 instead of 1, in step 6 of the procedures to manually set the registry
key.) If the registry key is present in both the HKEY_LOCAL_MACHINE registry hive and the HKEY_CURRENT_USER registry hive, the
HKEY_LOCAL_MACHINE hive setting takes priority.
Back to the top
How to set the HonorAutorunSetting registry key manually
Windows Server 2003 and Windows XP
1.
Click Start, and then click Run.
2.
In the Open box, type regedit, and then click OK.
3.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
4.
Right-click in the right pane, point to New, and then click DWORD Value.
5.
Type HonorAutorunSetting, and then press ENTER.
6.
In the Value data box, type 1, click Hexadecimal, if it is not already selected, and then click OK.
7.
Exit Registry Editor.
8.
Restart the system for the new settings to take effect.
Back to the top
WORKAROUND
We have tested the following workarounds.
Back to the top
Workaround 1: To prevent creating Autorun.inf files on shares
To prevent the Autorun feature from being invoked and to keep any programs from writing Autoun.inf files to mapped network
drives, follow these steps:
1.
Delete any Autorun.inf files from the root of a mapped network drive.
2.
Do not give anyone Create rights to the root of a mapped network drive.
Note After you implement this workaround, Autorun features will not be available from network drives.
Back to the top
Workaround 2: To disable the use of USB storage devices
The following Microsoft Knowledge Base article contains two methods to prevent users from connecting to a USB storage device:
823732 How to disable the use of USB storage devices
Note After you implement this workaround, USB storage devices no longer function on systems in which these changes are applied.
Back to the top
APPLIES TO
• Windows Vista Enterprise 64-bit Edition
• Windows Vista Home Basic 64-bit Edition
• Windows Vista Home Premium 64-bit Edition
• Windows Vista Ultimate 64-bit Edition
• Windows Vista Business 64-bit Edition
• Windows Vista Business
• Windows Vista Enterprise
• Windows Vista Home Basic
• Windows Vista Home Premium
• Windows Vista Starter
• Windows Vista Ultimate
• Windows Vista Service Pack 1
• Microsoft Windows XP Professional x64 Edition
• Microsoft Windows Server 2003 Service Pack 2, when used with:
Microsoft Windows Server 2003, Standard Edition (32-bit x86)
http://support.microsoft.com/kb/953252/en-us[8/27/2008 10:05:25 AM]
How to correct "disable Autorun registry key" enforcement in Windows
Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
Microsoft Windows Server 2003, Web Edition
Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
Microsoft Windows Server 2003, Standard x64 Edition
Microsoft Windows Server 2003, Enterprise x64 Edition
Microsoft Windows Server 2003, Datacenter x64 Edition
Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
Microsoft Windows XP Professional x64 Edition
• Microsoft Windows Server 2003 Service Pack 1, when used with:
Microsoft Windows Server 2003, Standard Edition (32-bit x86)
Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
Microsoft Windows Server 2003, Web Edition
Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
Microsoft Windows Server 2003, Standard x64 Edition
Microsoft Windows Server 2003, Enterprise x64 Edition
Microsoft Windows Server 2003, Datacenter x64 Edition
Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
• Microsoft Windows 2000 Service Pack 4, when used with:
Microsoft Windows 2000 Professional Edition
Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Datacenter Server
• Microsoft Windows XP Service Pack 2, when used with:
Microsoft Windows XP Professional
Microsoft Windows XP Home Edition
Microsoft Windows XP Tablet PC Edition
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Keywords: atdownload kbbug kbexpertiseinter kbfix kbpubtypekc kbsecbulletin kbsecurity kbsecvulnerability KB953252
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NoDriveTypeAutoRun
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Windows 2000 Resource Kit > Windows 2000 Registry Reference > HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Windows > CurrentVersion > Policies > Explorer
NoDriveTypeAutoRun
Resource Kit
Windows 2000 Registry Reference
HKEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Windows
CurrentVersion
Policies
Explorer
DisableLocalMachineRun
DisableLocalMachineRunOnce
NoDisconnect
NoDriveAutoRun
NoDriveTypeAutoRun
NoEncryptOnMove
NoFileAssociate
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
Data type
Range
Default value
REG_DWORD
0x0–0xFF
0x95
Description
Disables the Autoplay feature on all drives of the type specified.
Autoplay begins reading from a drive as soon as media is inserted in the drive. As a result, the setup file of programs and the sound on audio media starts
immediately.
This entry stores the setting of the Disable Autoplay Group Policy. Group Policy adds this entry to the registry when you enable the Disable Autoplay
policy. If you disable the policy or set it to Not configured, Group Policy deletes this entry from the registry, and the system behaves as though the value
is 0x95.
This entry is a bitmapped value. To disable Autoplay on a particular type of drive, set the bit representing that drive type to 1. To disable more than one
type of drive, set the bits representing each type to 1, or sum the hexadecimal values of the representative bits.
NoNTSecurity
Value
Meaning
NoWelcomeScreen
0x1
Disables Autoplay on drives of unknown type.
0x4
Disables Autoplay on removable drives.
0x8
Disables Autoplay on fixed drives.
0x10
Disables Autoplay on network drives.
0x20
Disables Autoplay on CD-ROM drives.
0x40
Disables Autoplay on RAM disks.
0x80
Disables Autoplay on drives of unknown type.
0xFF
Disables Autoplay on all types of drives.
Run
By default, Autoplay is disabled on removable drives, such as the floppy disk drive (but not the CD-ROM drive), and on network drives. The default
value 0x95 (149) is the sum of 0x1, 0x81 (unknown types), 0x4 (floppy drives), and 0x10 (network drives).
Change method
To change the value of this entry, use Group Policy. This entry corresponds to the Disable Autoplay Group Policy (Computer Configuration\Administrative
Templates\System).
Note
A Media Change Notification (MCN) message from the CD-ROM drive triggers Autoplay. If the Windows interface does not receive this message, Autoplay
does not operate, regardless of the value of this entry. Entries that suppress the MCN message, such as Autorun and AutoRunAlwaysDisable also disable
Autoplay.
http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/regentry/91525.mspx?mfr=true[8/27/2008 10:44:00 AM]
NoDriveTypeAutoRun
Autoplay is also disabled on any drive if it is disabled by the value of NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU).
But if NoDriveAutoRun or NoDriveTypeAutoRun appear in HKEY_LOCAL_MACHINE, the corresponding entries in HKEY_CURRENT_USER are ignored.
You can use the Disable Autoplay Group Policy to add CD-ROM drives to the list of drive types already disabled (removable drives, network drives, and
unknown drives) or to disable Autoplay on all drives. You must edit the registry to set any other value.
Tip
For detailed information about particular Group Policy settings, see the Windows 2000 Resource Kit Group Policy Reference.
For general information about Group Policy, see Windows 2000 Server Help or Windows 2000 Professional Help.
To see a table associating policies with their corresponding registry entries, see the Group Policy Registry Table .
Related Entries
Autorun
AutoRunAlwaysDisable
NoDriveAutoRun (in HKLM)
NoDriveAutoRun (in HKCU)
NoDriveTypeAutoRun (in HKCU)
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Autorun
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Windows 2000 Resource Kit > Windows 2000 Registry Reference > HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services > Cdrom
Autorun
Resource Kit
Windows 2000 Registry Reference
HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Services
Cdrom
Autorun
AutoRunAlwaysDisable
HKLM\SYSTEM\CurrentControlSet\Services\Cdrom
Data type
Range
Default value
REG_DWORD
0|1
1
Description
Determines whether the system sends a Media Change Notification (MCN) message to the Windows interface when it detects that a
CD-ROM is inserted in the drive. The MCN message triggers media-related features, such as Autoplay.
If the MCN message is disabled, the media features that use it do not operate.
Value
Meaning
0
Does not send an MCN message.
1
Sends an MCN message.
Change method
To change the value of this entry, use Device Manager.
Activation method
To make a change to this entry effective, you must restart Windows 2000.
Note
If the value of this entry is 0, Autoplay does not operate, regardless of the value of the NoDriveAutoRun entry (in HKLM and
HKCU) and the NoDriveTypeAutoRun entry (in HKLM and HKCU).
Tip
To disable Autoplay on particular drives, use NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU).
Do not disable the Media Change Notification message unless you have no alternative.
Related Entries
AutoRunAlwaysDisable
NoDriveAutoRun (in HKLM)
NoDriveAutoRun (in HKCU)
NoDriveTypeAutoRun (in HKLM)
NoDriveTypeAutoRun (in HKCU)
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Windows 2000 Resource Kit > Windows 2000 Registry Reference > HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services > Cdrom
AutoRunAlwaysDisable
Resource Kit
Windows 2000 Registry Reference
HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Services
Cdrom
Autorun
AutoRunAlwaysDisable
HKLM\SYSTEM\CurrentControlSet\Services\Cdrom
Data type
Range
Default value
REG_MULTI_SZ
Vendor or product identfiers
(List of identified products and product groups.)
Description
Suppresses the Media Change Notification (MCN) message for particular CD-ROM drives.
By default, the system sends an MCN message when a CD-ROM is inserted in a CD-ROM drive. The MCN message triggers media
features, such as Autoplay. When the MCN message is suppressed, these media features do not operate.
This entry identifies devices that do not support media features. Typically, this list consists of CD-ROM changers that do not support
Autoplay because they must load the media physically to verify that it is a compact disc before playing.
The entries in this list need not be complete device identifiers. The system suppresses the MCN message for all devices that begin
with the characters of an entry in the list. This method makes it easier to disable media features for all products of a certain vendor
or product line.
Note
If the value of this entry is not blank, it takes precedence over a value of 1 in AutoRun for the particular devices identified.
If a device is identified in this list, Autoplay does not operate on the device, regardless of the value of the NoDriveAutoRun entry
(in HKLM and HKCU) and the NoDriveTypeAutoRun entry (in HKLM and HKCU).
The identifiers listed in this value are those reported to the system by the device. These identifiers might differ from those listed on
the drive housing.
The default value for this entry consists of products and product groups that have been identified through testing as being unable to
support Autoplay. This list might change as testing progresses and products are updated.
Tip
To disable Autoplay on particular drives, use the NoDriveAutoRun entry (HKLM or HKCU) or the NoDriveTypeAutoRun entry
(HKLM or HKCU). Do not disable the MCN message unless you have no alternative.
Caution
Do not change the value of this entry. If you add or remove items from the list, your CD-ROM drives might not operate properly.
Related Entries
Autorun
NoDriveAutoRun (in HKLM)
NoDriveAutoRun (in HKCU)
NoDriveTypeAutoRun (in HKLM)
NoDriveTypeAutoRun (in HKCU)
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Windows 2000 Resource Kit > Windows 2000 Registry Reference > HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Windows > CurrentVersion > Policies > Explorer
NoDriveAutoRun
Resource Kit
Windows 2000 Registry Reference
HKEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Windows
CurrentVersion
Policies
Explorer
DisableLocalMachineRun
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
Data type
Range
Default value
REG_DWORD
0x0–0x3FFFFFF (bitmapped value)
0x0
Description
Determines whether the Autoplay feature is enabled on each drive connected to the system. When Autoplay is enabled, media starts automatically when it
is inserted in the drive.
NoDisconnect
The value of this entry consists of 32 bits. The lower 26 bits each represent a drive, with the lowest (right-most) bit representing drive A, and the 26th bit
from the right representing drive Z. If a bit is set to 0, the Autoplay feature is enabled on that drive. If a bit is set to 1, the Autoplay feature is disabled on
that drive.
NoDriveAutoRun
For example, if the value of this entry is 0x8 (1000 binary), Autoplay is disabled on drive D.
DisableLocalMachineRunOnce
NoDriveTypeAutoRun
NoEncryptOnMove
NoFileAssociate
NoNTSecurity
NoWelcomeScreen
Run
Note
A Media Change Notification (MCN) message from the CD-ROM driver triggers Autoplay. If the Windows interface does not receive this message, Autoplay
does not operate, regardless of the value of this entry. Entries that suppress the MCN message, such as Autorun and AutorunAlwaysDisable , also disable
Autoplay.
Autoplay is also disabled on any drive if it is disabled by the value of NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU).
But if either of these entries appear in HKEY_LOCAL_MACHINE, the corresponding entries in HKEY_CURRENT_USER are ignored.
Although this entry is located in the Policies\Explorer subkey, it is not associated with a Group Policy included in Windows 2000.
Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.
Tip
For detailed information about particular Group Policy settings, see the Windows 2000 Resource Kit Group Policy Reference.
For general information about Group Policy, see Windows 2000 Server Help or Windows 2000 Professional Help.
Related Entries
Autorun
AutoRunAlwaysDisable
NoDriveAutoRun (in HKCU)
NoDriveTypeAutoRun (in HKLM)
http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/regentry/93506.mspx[8/27/2008 10:49:13 AM]
NoDriveAutoRun
NoDriveTypeAutoRun (in HKCU)
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Windows 2000 Resource Kit > Windows 2000 Registry Reference > HKEY_CURRENT_USER > Software > Microsoft > Windows > CurrentVersion > Policies > Explorer
NoDriveAutoRun
Resource Kit
Windows 2000 Registry Reference
HKEY_CURRENT_USER
Software
Microsoft
Windows
CurrentVersion
Policies
Explorer
ClassicShell
ClearRecentDocsOnExit
DisableLocalMachineRun
DisableLocalMachineRunOnce
DisablePersonalDirChange
DisallowCpl
DisallowRun
EnforceShellExtensionSecurity
ForceActiveDesktopOn
ForceStartMenuLogOff
GreyMSIAds
Intellimenus
LinkResolveIgnoreLinkInfo
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Data type
Range
Default value
REG_DWORD
0x0–0x3FFFFFF ( bitmap )
0x0
Description
Determines whether Autoplay is enabled on each drive connected to the system. When Autoplay is enabled, media starts automatically when it is inserted in the drive.
The value of this entry consists of 32 bits. The lower 26 bits each represent a drive, with the lowest (right-most) bit representing drive A, and the 26th bit from the
right representing drive Z. If a bit is set to 0, the Autoplay feature is enabled on that drive. If a bit is set to 1, the Autoplay feature is disabled on that drive.
For example, if the value of this entry is 0x8 (1000 binary), Autoplay is disabled on drive D.
Note
Autoplay is triggered by a Media Change Notification (MCN) message from the CD-ROM driver. If the Windows 2000 interface does not receive this message, Autoplay
does not operate, regardless of the value of this entry. Entries that suppress the MCN message, such as Autorun and AutoRunAlwaysDisable also disable Autoplay.
Autoplay is also disabled on any drive if it is disabled by the value of NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU). However, if
NoDriveAutoRun or NoDriveTypeAutoRun appear in HKEY_LOCAL_MACHINE, the corresponding entries in HKEY_CURRENT_USER are ignored.
Although this entry is located in the Policies\Explorer subkey, it is not associated with a Group Policy setting in Windows 2000.
Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.
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Windows 2000 Resource Kit > Windows 2000 Registry Reference > HKEY_CURRENT_USER > Software > Microsoft > Windows > CurrentVersion > Policies > Explorer
NoDriveTypeAutoRun
Resource Kit
Windows 2000 Registry Reference
HKEY_CURRENT_USER
Software
Microsoft
Windows
CurrentVersion
Policies
Explorer
ClassicShell
ClearRecentDocsOnExit
DisableLocalMachineRun
DisableLocalMachineRunOnce
DisablePersonalDirChange
DisallowCpl
DisallowRun
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Data type
Range
Default value
REG_DWORD
0x0–0xFF
0x95
Description
Disables the Autoplay feature on all drives of the type specified.
Autoplay begins reading from a drive as soon as media is inserted in the drive. As a result, the setup file of a program or the sound on audio media starts
immediately.
This entry stores the setting of the Disable Autoplay Group Policy. Group Policy adds this entry to the registry when you enable the policy. If you disable the policy
or set it to Not configured, Group Policy deletes this entry from the registry, and the system behaves as though the value is 0x95.
This entry is a bitmapped value. To disable Autoplay on a particular type of drive, set the bit representing that type of drive to 1. To disable more than one type of
drive, either set the bits representing each type to 1 or sum the hexadecimal values of the representative bits.
Value
Meaning
0x1
Disables Autoplay on drives of unknown type.
ForceStartMenuLogOff
0x4
Disables Autoplay on removable drives.
GreyMSIAds
0x8
Disables Autoplay on fixed drives.
0x10
Disables Autoplay on network drives.
0x20
Disables Autoplay on CD-ROM drives.
0x40
Disables Autoplay on RAM drives.
0x80
Disables Autoplay on drives of unknown type.
0xFF
Disables Autoplay on all types of drives.
EnforceShellExtensionSecurity
ForceActiveDesktopOn
Intellimenus
LinkResolveIgnoreLinkInfo
MaxRecentDocs
MemCheckBoxInRunDlg
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NoClose
NoCloseDragDropBands
NoCommonGroups
NoComputersNearMe
NoControlPanel
NoDeletePrinter
NoDesktop
NoDFSTab
NoDriveAutoRun
NoDrives
NoDriveTypeAutoRun
By default, Autoplay is disabled on network drives and on removable drives, such as the floppy disk drive (but not the CD-ROM drive). The default value 0x95 (149) is
the sum of 0x1 (unknown types), 0x80 (unknown types), 0x4 (floppy drives), and 0x10 (network drives).
Change method
To change the value of this entry, use Group Policy. This entry corresponds to the Disable Autoplay Group Policy (User Configuration\Administrative
Templates\System).
Note
Autoplay is triggered by a Media Change Notification (MCN) message from the CD-ROM driver. If the Windows 2000 interface does not receive this message, Autoplay
does not operate, regardless of the value of this entry. Entries that suppress the MCN message, such as Autorun and AutorunAlwaysDisable also disable Autoplay.
Autoplay is disabled on any drive if the value of NoDriveAutoRun (in HKLM or HKCU) or NoDriveTypeAutoRun (in HKLM or HKCU) is set to disable it. But if
NoDriveAutoRun or NoDriveTypeAutoRun appear in HKEY_LOCAL_MACHINE, the corresponding entries in HKEY_CURRENT_USER are ignored.
You can use the Disable Autoplay Group Policy to add CD-ROM drives to the list of drive types already disabled (removable drives, network drives, and unknown
drives) or to disable Autoplay on all drives. You must edit the registry to set any other value.
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NoFolderOptions
Tip
For detailed information about particular Group Policy settings, see the Windows 2000 Resource Kit Group Policy Reference.
For general information about Group Policy, see Windows 2000 Server Help or Windows 2000 Professional Help.
NoHardwareTab
To see a table associating policies with their corresponding registry entries, see the Group Policy Registry Table .
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NoRecentDocsMenu
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How to back up and restore the registry in Windows
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This article was previously published under Q322756
On This Page
SUMMARY
Back up the registry
Guided Help to export registry keys and to back up the registry in Windows XP
Manual steps to back up the registry in Windows Vista or in Windows XP
Windows Vista
Windows XP
Restore the registry
Manual steps to restore the registry in Windows Vista or Windows XP
Use System Restore to undo registry changes in Windows Vista or in Windows XP
Windows Vista
Windows XP
Article ID
: 322756
Last Review : November 20, 2007
Revision
: 7.6
Similar solutions
Information for other Windows operating systems and advanced users
SUMMARY
This article describes how to back up the registry in Windows XP or Windows Vista.
Back to the top
Back up the registry
Guided Help to export registry keys and to back up the registry in Windows XP
Guided Help is available to export registry keys and to back up the registry. Guided Help can automatically perform
the steps for you.
The actions that this Guided Help performs cannot be undone after Guided Help is finished.
Requirements to install and to use this Guided Help
• You must be logged on to Windows by using a computer administrator account to install and to use this Guided
Help.
• You must be running an English version of Windows XP Home Edition, Windows XP Professional, Windows XP
Media Center Edition, or Windows XP Tablet PC Edition to install and to use this Guided Help.
You must first download Guided Help. To start, click the following link:
Download Guided Help
Manual steps to back up the registry in Windows Vista or in Windows XP
Windows Vista
Click Start
Live Search
Advanced Search
How to back up and restore the registry in Windows
1.
Web
, type systempropertiesprotection in the Start Search box, and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
2.
Wait for Windows to search for available disks and most recent restore points. In the System Properties dialog box, on the
System Protection tab, click Create,
3.
Type a name for the restore point and then click Create.
4.
After the restore point has been created successfully, click OK two times.
Note If System Restore is turned off, click to select the local disk, click Apply and then click Create.
Windows XP
1.
Click Start, click Run, type %SystemRoot%\system32\restore\rstrui.exe, and then click OK.
2.
On the Welcome to System Restore page, click Create a restore point, and then click Next .
3.
On the Create a Restore Point page, type a name for the restore point and then click Create
4.
After the restore point has been created, click Close.
Note If System Restore is turned off, you receive a message that asks whether you want to turn on System Restore now. Click
Yes. Then, in the System Properties dialog box, click to clear the Turn off System Restore check box, click OK, and then
repeat this step.
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Restore the registry
http://support.microsoft.com/kb/322756/[8/27/2008 11:10:53 AM]
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How to back up and restore the registry in Windows
Manual steps to restore the registry in Windows Vista or Windows XP
Use System Restore to undo registry changes in Windows Vista or in Windows XP
Windows Vista
1.
Click Start
, type systempropertiesprotection in the Start Search box, and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
2.
In the System Properties dialog box, on the System Protection tab, click System Restore,
3.
In the System Restore dialog box select Choose a different restore point, and then click Next
4.
Select the restore point that you want to use, and then click Next.
5.
Confirm your restore point, and then click Finish System restore restores the selected Windows Vista configuration and then
restarts the computer.
6.
Log on to the computer. When the System Restore confirmation page appears, click OK..
Windows XP
1.
Click Start, click Run, type %SystemRoot%\System32\Restore\Rstrui.exe, and then click OK.
2.
On the Welcome to System Restore page, click Restore my computer to an earlier time (if it is not already selected),
and then click Next .
3.
On the Select a Restore Point page, click the system checkpoint. In the On this list select the restore point area, click
an entry that is named "Guided Help (Registry Backup)," and then click Next. If a System Restore message appears that
lists configuration changes that System Restore will make, click OK.
4.
On the Confirm Restore Point Selection page, click Next. System Restore restores the previous Windows XP configuration
and then restarts the computer.
5.
Log on to the computer. When the System Restore confirmation page appears, click OK..
Back to the top
Similar solutions
320820 How to use the Backup utility to back up files and folders in Windows XP Home Edition
308422 How to use the Backup utility that is included in Windows XP to back up files and folders
309340 How to use Backup to restore files and folders on your computer in Windows XP
310405 How to turn off and turn on System Restore in Windows XP
Back to the top
Information for other Windows operating systems and advanced users
256986 Windows registry information for advanced users
915092 Description of Guided Help for Microsoft Knowledge Base articles
Back to the top
APPLIES TO
• Microsoft Windows XP Home Edition
• Microsoft Windows XP Professional
• Microsoft Windows XP Tablet PC Edition
• Microsoft Windows XP Media Center Edition
• Windows Vista Business
• Windows Vista Enterprise
• Windows Vista Home Basic
• Windows Vista Home Premium
• Windows Vista Ultimate
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Keywords: kbacw kbhowto kbresolve kbacwsurvey kbregistry kbgpo kbbackup kbhowtomaster kbenv KB322756
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Help and Support
http://support.microsoft.com/kb/322756/[8/27/2008 11:10:53 AM]
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