Member Avatar for JNT

As Windows began to run, I get the blue screen of death with the error: STOP: C000021a Fatal System Error. The winbdows logonb process system process terminated unexpectedly with a status of 0xc0000006 (0x75eb4f51 0x0069el5c). The system has been shut down

How do I fix this? if possible....

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Dani AI

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Quick summary and what to try first: is hitting a STOP C000021A (status 0xc0000006) during boot and the F8/Last Known Good attempts didn’t let Windows stay up. ’s Last Known Good and ’s memory check idea are good early triage steps; the next moves below try to recover without doing a full reinstall. If the system holds no interactive options (you can’t get to Safe Mode or Repair), skip to the recovery-media steps.

For Windows XP (use the original XP CD): boot from the CD, press R to enter the Recovery Console, pick the installation and give the Administrator password. Run disk and boot repairs first—these often fix file/boot corruption:

chkdsk C: /r
fixboot C:
fixmbr
exit

If a specific system driver/DLL is damaged you can restore it from the CD (replace X: with the CD drive): 

copy X:\i386\ntfs.sys C:\Windows\System32\drivers\ntfs.sys

(Recovery Console requires the admin password and an XP CD that matches the installed service‑pack level.) (support.microsoft.com)

For Vista/7/8/10/11: boot installation media → Repair your computer → Advanced Options → Command Prompt (or try Startup Repair/System Restore first). Useful command sequence from WinRE:

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd

# For Win8+ (from a working environment or WinRE with a source)
dism /online /cleanup-image /restorehealth
sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows

Run DISM before SFC on Win8/10/11; use the /off* switches when repairing an offline installation. (support.microsoft.com)

Additional troubleshooting and safety notes: run a full RAM test from a bootable tool such as MemTest86 (test each DIMM one at a time; replace any module that fails). If you need to preserve files, boot a Linux/Windows PE USB or remove the drive and copy data to another PC before aggressive repairs. If none of the recovery steps work, a repair install (or clean reinstall) is the last resort—make sure any XP repair CD exactly matches the installed service pack to avoid mismatched system files. (memtest86.com)

If specific command output or errors appear, list them (exact text) for the next targeted step.

Recommended Answers

All 8 Replies

Member Avatar for caperjack

start with this ,
press f8 during startup before the winlogo comes up, and choose "last configuration that worked"

Member Avatar for JNT

Tried that and the same error came up.

Member Avatar for caperjack

Tried that and the same error came up.

OK,anything else you tried before i suggest something else you already done

Member Avatar for JNT

That was it. I am running the system diagnostics from dell system tree

Member Avatar for BlackFetus

..check your memory, clean it if possible..try to replace or swap a new memory to your old memory..if the issue still continues, repair your operating system..i hope it works!..^_^..

Member Avatar for PhilliePhan

Did you look at this?

http://support.microsoft.com/kb/156669

The STOP 0xC000021A error occurs when either Winlogon.exe or Csrss.exe fails. When the Windows NT kernel detects that either of these processes has stopped, it stops the system and raises the STOP 0xC000021A error. This error may have several causes. Among them are the following:

* Mismatched system files have been installed.
* A Service Pack installation has failed.
* A backup program that is used to restore a hard disk did not correctly restore files that may have been in use.
* An incompatible third-party program has been installed.

EDIT: Just noticed "last known good" already suggested...

Edited by PhilliePhan because: n/a
Member Avatar for JNT

The computer will not let me do anything. It keeps giving me the eroor message. It will let me go into the option screen after hitting f8 but when I choose an option it gives me the error again.

Member Avatar for xcellpro6

Hi

Insert the XP CD, boot from it. You need to do a repair install, do not choose repair from first window as this is the repair console. have the XP license key handy, on the cd packaging or a sticker on your desktop case or bottom of your laptop.

this will fix your fatal error .... your files and installed software will not be affected.

hope this helps

darren

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