How do I fix a BSOD with the C000021a // 0xC000135 error message appearing before the Windows log in stage?

Posted on 2008-10-22
Medium Priority
Last Modified: 2013-12-28
Hello everyone,

Yesterday, after a sudden reboot, I got the blue screen with the following error message:
"Stop: C000021a {Fatal System Error} The Windows Logon Process system terminated unexpectedly with a status of 0XC000135 (0x00000000 0x00000000). The system has been shut down."

System: Sony Vaio VGN-SZ160P laptop  with Windows XP Pro installed on it (no new part except a 1Gb of additional RAM has been added).
(Note: My computer did not come with the recovery disks, and apparently Sony does not carry the disks anymore. since it's more than two years old).

What happened before I got the message:
I turned on the computer and everything went well after a cold reboot. Windows update notification popped up informing me that new updates are being installed on the system. After the installation was complete (no prompt on "restart is required"), I ran a full diagnostic through Symentac (deleting temp files, runnig a virus scan, and defragmenting the HDD). Then, I decided to clean up some space and get rid of some of the programs I did not need (among those, I deleted Adobe Reader 7.0.5 with update [since I had adobe reader professional 7.1 installed], AnyDVD, Safari browser, Google Toolbar for IE Explorer, and couple of other 3rd party programs). However, in the middle of these removals, my computer suddenly rebooted (I assume one of the programs required a booting to complete the uninstalling process)..Next thing I know, I am stock with the BSOD.

I tried to access the operating system under the safe mode, however NONE of the options work. And, as I mentioned earlier, I don't have a recovery disk set to be able to get the recovery console or perform an in-place OS installation. I have been researching on the topic for a few hours now, and every working solution so far has either been with accessibility to command prompt under the safe mode, or an in-place OS installation. Some one else had suggested to access the system via Knoppix.

I have many important files on this computer, so, naturally, I would like to keep a clean install as my last resort.
I am really desperate to get my system back up and running. Any help or suggestion is truly appreciated.

Thanks. - Amir
Question by:aah57
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Expert Comment

ID: 22779494
Try pressing F8 as the PC starts up. Do you see a screen? If so, try selecting "Safe Mode" and booting from there.

Expert Comment

ID: 22779529
You can purchase the sony recovery cds here

The only other thing is to get a copy of XP and do a repair install.

Author Comment

ID: 22779551
I can access the Safe Mode option menu on the startup.. But, any option of the Safe Mode I choose including the Last Known Working Configuration
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Author Comment

ID: 22779579
aah57:I can access the Safe Mode option menu on the startup.. But, any option of the Safe Mode I choose including the Last Known Working Configuration does NOT work... (Sorry for the repost, the previous one was incomplete.)

Expert Comment

ID: 22779599
Try a livecd.
You can then copy the files to a Flash drive/external drive.

Author Comment

ID: 22779668
Thank you. I will do that once I get home from work tonight. However, that is still an arbitrary solution to the actual problem.

Expert Comment

ID: 22779726
Now What you will want to do is to copy the "Documents and Settings" folder, and after copying it search it carefully to make sure it has no windows executables (.exe) which can be a possible virus (unless you are risky. Copy any other folders containing your data also. Then reinstall windows and set back up the previous user accounts, and boot back up into the livecd and replace the "Documents and Settings" folder from the backup. Also put back in all you other saved files. Have a good day.

Author Comment

ID: 22779878
On the SZ serioes Sony laptop you have a passowrd protected folder (also accessable through the finger biometric reader) that I have most of my files there.. Generally the folder is hidden and frankly I never tired to access it outside of the Windows platform... I am not too sure how this makes it more complicated..

Anyways,  back to the original question: How do I fix the error if I have no access to the files. I also have an XP Pro CD from my old desktop computer, but even after changing the BIOS to read from the internal optical drive first, the CD does not boot.

Author Comment

ID: 22781163
I did a bit of a research on the 0xC000135 error code and it seems like it's mainly tied to .NET failure. Here's a link here on EE that also has discussed the same problem but for a different error code:

ALSO, what I failed to mention previously is that I have the SP3 installed on the system...

Accepted Solution

aah57 earned 0 total points
ID: 22798603
I ran the ERD Commander on the computer and restored the system to an operating boot from the day before the crash. Everything is back up and running. I solved my own problem.

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