BSOD on boot error c000021a
When I turn my Windows XP Professional PC on it goes past the Windows XP loading screen then I get blue screen of death with the error C000021a the session manager initialization system process terminated unexpectedly with a status of 0xc000003a I have no idea what the error means or how to fix it any help would be appreciated
I have tried to boot off Windows XP and recovery mody chkdsk /r but this didn't fix it
ben950
studiohack2 Answers
Things you can try:
Restore to last known good configuration:
When booting, press
[F8]right after hearing the "beep" and selectLast Known Good Configuration.Use System Restore:
When booting, press
[F8]right after hearing the "beep" and selectSafe mode with a Command prompt, the execute%systemroot%\system32\restore\rstrui.exe.If none of the above works, boot from the Windows XP installation disc and choose
RforRecovery consoleand execute the following commands (source):md tmp copy c:\windows\system32\config\system c:\windows\tmp\system.bak copy c:\windows\system32\config\software c:\windows\tmp\software.bak copy c:\windows\system32\config\sam c:\windows\tmp\sam.bak copy c:\windows\system32\config\security c:\windows\tmp\security.bak copy c:\windows\system32\config\default c:\windows\tmp\default.bak delete c:\windows\system32\config\system delete c:\windows\system32\config\software delete c:\windows\system32\config\sam delete c:\windows\system32\config\security delete c:\windows\system32\config\default copy c:\windows\repair\system c:\windows\system32\config\system copy c:\windows\repair\software c:\windows\system32\config\software copy c:\windows\repair\sam c:\windows\system32\config\sam copy c:\windows\repair\security c:\windows\system32\config\security copy c:\windows\repair\default c:\windows\system32\config\default exitthen try again.
DennisIf the suggestion by Dennis does not work
How to do a Manual SYSTEM RESTORE in XP
A. Connect your non-bootable hard drive to another computer, as a secondary drive or use a usb adapter or enclosure, If you can see your data on the drive, back it up Now, then follow the rest of these instructions.
B. Open Windows Explorer. Click on Tools|Folder Options|View. Check the box beside "Show hidden files and folders". Apply your change.
NOTE D: may not represent the hard drive you connected to your PC, it may be E: or F: or G:, it all depends on how many other drives (including cd/dvd) you have in your host PC, So substitute the appropriate drive letter in the instructions below.
C. Navigate to the D:\System Volume Information folder. You will see a folder named something like _restore{.........} the dots represent an alpha-numeric sequence.
In this folder you will see folders named RP0....RPnn. Find the one with the highest number.
These are your System Restore points. In the highest numbered folder you will see a folder named snapshot. In this folder are registry hive files which you need to recover your system:
_registry_user_.default
_registry_machine_security
_registry_machine_software
_registry_machine_system
_registry_machine_sam
D. Create a subdirectory; i.e, D:\Windows\TMP. Copy these files to the TMP subdirectory. Rename them to:
default
SECURITY
software
system
SAM
Note Be sure to lose the period (.) in the file named _registry_user_.default
E. Delete the files in the D:\windows\system32\config subdirectory with the same short names.
F. Copy the D:\windows\tmp files to the D:\windows\system32\config. subdirectory.
G.Put your drive back in its original system. Your system should start normally. If you get the same error repeat the procedure and choose another folder ( RPnn) (next highest number). You can repeat this procedure choosing lower RPnn numbers until you get it booting again.
If you are denied access to any folders you will have to take "Ownership" of the folders first. http://support.microsoft.com/kb/308421
If this procedure fails to work you need to repair or reinstall Windows.
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