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Persistant Restarting/BSOD

Last response: in Windows XP
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August 6, 2010 2:41:15 AM

Hi all,

My computer suddenly started restarting today. It functioned perfectly yesterday. As far as I know, there have been no updates/patches/etc. to my machine.

Most of the time, the machine will make it past the startup Widows splash and will start loading the desktop when it will restart. Sometimes the computer restarts right near the end of the Windows splash section.

Occasionally I can get the computer to start up in safe mode, but there are times when the computer hangs on the login screen (before the user names appear) or will restart. As far as I can tell, once the computer is up in safe mode, it is stable.

When I turn off the auto-restart, I see a BSOD with the error #c000021a. Help would be welcome.
August 6, 2010 3:02:40 AM

List the system specs. So far all we know is you have a computer which encompasses infinite possibilities as far as the 'wut' factor is concerned.
August 6, 2010 3:07:03 AM

It's an old p4 2.8 system running XP SP2. What other information do you need?
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August 6, 2010 3:16:42 AM

You might try reading this from Microsoft. Personally I would try using one DIMM RAM in slot 1 and see if the system boots to desktop.. Use a DIMM other than the one in the first slot currently. If after trying different RAM combinations doesnt work, a repair install of XP may might be tried by booting to the installation CD if possible. Beyond that if a hardware problem has occured, spare parts would be needed to test further.

http://support.microsoft.com/default.aspx?scid=kb;en-us;156669
August 6, 2010 3:19:57 AM

Just ran full virus scan in safe mode and found some java trojans, which I quarantined. Now I get a new persistent error along the lines of:

winlogon.exe has an error, this service must be ended

At which point my computer restarts.

It does boot in safe mode though.
August 6, 2010 3:29:07 AM

I'm about 99% positive that it is not a hardware issue. It seems that following the logic of the link you posted that there is some corruption of the winlogon process. I've looked through regedit for a Gina dll value, but there doesn't appear to be any. Correct me if I'm wrong, but doesn't this mean that the default msgina.dll file is being used? Should I just proceed with a windows repair? Would that solve this problem? I can't seem to find my windows cd which is why I haven't already done it.

edit*

When I start up in safe mode with networking, I get the winlogon.exe error, although I do not get it when I'm just in regular safe mode.
August 6, 2010 3:31:27 AM

Try ccleaner registry repair in safe mode first. Its worth a shot. But yeah, a repair install will bring the OS back to the point on the installation CD.
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