error stop c000021a

Clarifications

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.

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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.

http://www.aumha.org/a/stop.php
0xC000021A: STATUS_SYSTEM_PROCESS_TERMINATED
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
http://support.microsoft.com/?kbid=316503&sd=RMVP

Internet Explorer Maintenance Policies May Cause an Access Violation in Winlogon {KB 318666} Win XP Pro
http://support.microsoft.com/?kbid=318666&sd=RMVP

0x00000050: PAGE_FAULT_IN_NONPAGED_AREA
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).
http://support.microsoft.com/?kbid=171003&sd=RMVP
(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.
http://support.microsoft.com/kb/314058
http://www.michaelstevenstech.com/r_c_cmds.htm
http://www.windowsreinstall.com/arti...ommandline.htm

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There is additional information on the Microsoft web site here:

http://support.microsoft.com/default.aspx?scid=kb;en-us;156669

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Hope that helps.

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

Advanced troubleshooting for shutdown problems in Windows XP

http://support.microsoft.com/kb/308029

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.

Keep us informed as to your progress if you require further assistance.

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