error stop c000021a

By cerutti ·
after shut down my windows xp the bleu screen comes on with the following message
error stop c000021a the windows logon process system terminated unexpectedly with status o 0x00000000.

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re: stop error

by ThumbsUp2 In reply to error stop c000021a

Have you tried using Google to look up the stop error codes to see what they mean? I did, and this is what I found on another site.


I would suspect that either a bad hard disk (run chkdsk) bad RAM , or a third party boot loader or backup utility (goback) is the cause.
This occurs when Windows switches into kernel mode and a user-mode subsystem, such as Winlogon or the Client Server Runtime Subsystem (CSRSS), is compromised. Security can no longer be guaranteed. Because Win XP can?t run without Winlogon or CSRSS, this is one of the few situations where the failure of a user-mode service can cause the system to stop responding. This Stop message also can occur as a result of malware infestation or when the computer is restarted after a system administrator has modified permissions so that the SYSTEM account no longer has adequate permissions to access system files and folders.
GoBack Causes a Stop Error C000021a {KB 316503} Win XP

Internet Explorer Maintenance Policies May Cause an Access Violation in Winlogon {KB 318666} Win XP Pro

Requested data was not in memory. An invalid system memory address was referenced. Defective memory (including main memory, L2 RAM cache, video RAM) or incompatible software (including remote control and antivirus software) might cause this Stop message, as may other hardware problems (e.g., incorrect SCSI termination or a flawed PCI card).
(You recieved this error during setup)

I would start using just one stick of RAM
If you still get the errors, try with another single stick.

Boot to the recovery console and run chkdsk on the hard drive.


There is additional information on the Microsoft web site here:;en-us;156669


Hope that helps.


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It can also be an application error

by w2ktechman In reply to error stop c000021a

that does not shut down properly. Try running the user profile hive cleanup utility (uphclean) from MS (free download).

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not helpul

by cerutti In reply to It can also be an applica ...

hi w2ktechman
thanks or your answer but i already try it and do not solve my problem
i was looking and most of the descriptions related my error are about booting and not as inj my case when shutdown,
if you have or find any other hint is welcome


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Have you checked this article

by Jacky Howe In reply to error stop c000021a

Advanced troubleshooting for shutdown problems in Windows XP
Check to see if the WaitToKillServiceTimeout has been modified.
Click Start, Run and type Regedt32 and press Enter.
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control.
Click on the "Control" Folder. In the right hand pane you will see WaitToKillServiceTimeout
Right click on it and select Modify. The default value is 20000.
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