not sure were to post this

Getting blue screen with message: Stop: C000021 Fatal System Error, windows login process terminated with status of (Ox0000005) (0x000000000) System shut down. Even in safe mode, windows starts to load but then I get the error

Based on my research, the Stop 0xC000021A message occurs when Windows XP

Professional switches into kernel mode and a user-mode subsystem, such as
Winlogon or the Client Server Runtime Subsystem (CSRSS), is compromised and security can no longer be guaranteed. Because Windows XP Professional
cannot 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. For more information and possible resolutions about this error,
please refer to the following link:

http://www.microsoft.com/resources/documentation/Windows/XP/all/reskit/en-us
/Default.asp?url=/resources/documentation/Windows/XP/all/reskit/en-us/prmd_s
tp_mtgk.asp

More info:

156669 How to troubleshoot a "STOP 0xC000021A" error
http://support.microsoft.com/?id=156669

330303 "STOP: c000021a (Fatal System Error)" Error Occurs
http://support.microsoft.com/?id=330303

thanks for your time and input