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Fatal Error (stop:c000021a) on start-up


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#1 lather

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Posted 29 October 2012 - 09:07 PM

I recently got back from holiday to be confronted with a couple of problems on my parent's laptops. My dad had used his laptop to visit a website and AVG's Resident Shield flagged up an alert. Not knowing what to do when he saw the AVG pop-up, he did a hard shutdown of the laptop and decided to wait until I got back so that I could sort it out for him - When I did an AVG scan, that showed an infection by Dropper.BCMiner, but a combination of AVG and MBAM scans eliminated it OK so that laptop is now fine again.

However, after getting the AVG alert, as he still wanted to visit the site in question, my dad then did a very silly thing - He got my mum's laptop and used it to visit the same site that had given the AVG alert, and now that has a problem I can't fix! Basically, while he was using it, it began to have issues, as the mouse pointer disappeared and wouldn't come back, so he did another hard shutdown of that machine too. Now, when I try to boot it up, Windows begins to load, but stops at a black screen of death with the message "stop:c000021a {Fatal Error} The windows logon process system process terminated unexpectedly with a status of 0xc0000034(0x00000000)(0x00000000)".

A little bit of research into that error message led me to this page here: http://answers.microsoft.com:80/en-us/windows/forum/windows_xp-system/stopc000021a-fatal-error-the-windows-logon-process/bfc382ca-f46c-4d07-9369-abc938371177. That suggests the problem is probably a missing or corrupt winlogon.exe file, and that you should replace it from c:\windows\system32\dllcache, or from either a Windows CD or another computer. The only way I can get the machine to boot is by using a copy of Hiren's BootCD, which allows me to go into the Mini XP on there. Using that, I ran Spybot S&D, which came up clear, and tried running MBAM, but it wouldn't let me. I used the programs on the disk to copy the backup winlogon.exe file from c:\windows\system32\dllcache, but that had no effect and the machine still wouldn't boot. So I then tried donating a copy of the file from my laptop, but that also had no effect.

So, according to everything I've read, the error message I'm getting indicates a corrupt winlogon.exe file. However, despite following the advice given for fixing that problem, the computer still fails to boot from the HDD and I'm now completely baffled as to what the problem could be. Is there anyone out there who can help me figure out what the problem actually is and how I can fix it?

Edited by hamluis, 30 October 2012 - 06:13 AM.
Moved from XP to Am I Infected - Hamluis.


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#2 boopme

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Posted 03 November 2012 - 08:31 PM

Sorry for the delay...
I think we should get a deeper look. Please follow this Preparation Guide and post in a new topic.
If Gmer won't run,skip it.

Let me know if all went well.
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#3 lather

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Posted 05 November 2012 - 11:01 AM

Thanks for the help!

As per your request, new topic started here: http://www.bleepingcomputer.com/forums/topic474173.html

Unfortunately, things don't look good, as even DDS and GMER are having problems!! :(


Edit:
Didn't notice at the time that the new thread has ended up in a different part of the forum - Is that the place where you want it, or should it be here?

Edited by lather, 05 November 2012 - 04:51 PM.


#4 boopme

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Posted 05 November 2012 - 07:54 PM

That's perfect and a good explanation on why the DDS tools did not work.

Now that your log is properly posted, you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a Malware Removal Team member, nor should you continue to ask for help elsewhere. Doing so can result in system changes which may not show it the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the Malware Removal Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the Malware Removal Team members are very busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the Malware Removal Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another MRL Team member is already assisting you and not open the thread to respond.

The current wait time is 1 - 2 days and ALL logs are answered.

If HelpBot replies to your topic, PLEASE follow Step One so it will report your topic to the team members.

To avoid confusion, I am closing this topic.
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