On a computer that is running Windows Server 2008 or Windows Vista Service Pack 1 (SP1), you repeatedly encounter stop error code 0x00000050 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
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.

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