Open Software Solutions

On a computer that is running Windows Server 2008 or Windows Vista Service Pack 1 (SP1), you repeatedly encounter stop error code 0×00000050 during the user logon or logoff process. Then, the computer restarts automatically.

When this issue occurs, the following event may be logged in the System log:

Log Name: System
Source: Microsoft-Windows-Kernel-General
Date: date & time
Event ID: 5
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: computer name
Description:{Registry Hive Recovered} Registry hive (file): ‘ ?? C: Users user name ntuser.dat’ was corrupted and it has been recovered. Some data might have been lost.

Note This issue frequently occurs on Windows Server 2008-based terminal servers.

This issue occurs when the computer contains corrupted user profiles.

Windows Server 2008 and Windows Vista SP1 try to correct profiles when the profiles are corrupted. However, the registry self-correcting feature incorrectly calculates a structure size. Therefore, the system accesses an invalid memory address.

Hotfix information for Windows Server 2008

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a Hotfix download available section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

Note The Hotfix download available form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix, you must be running Windows Server 2008 or Windows Vista Service Pack 1.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other previously released hotfixes.

Registry information

To use this hotfix, you do not have to make any changes to the registry.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Server 2008 and Windows Vista file information note

The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately . MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.

Windows Server 2008 and Windows Vista, x86-based version

Windows Server 2008 and Windows Vista, x64-based version

Windows Server 2008, Itanium-based version

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the Applies to section.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista

Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista

Additional files for all supported Itanium-based versions of Windows Server 2008