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I've got these problems:

1) sometimes winlogon.exe crashes at boot-up and my whole computer shuts off once i click "no" to visual-studio-2008 just-in-time-debugger window, takes about 30 secs until my harddrives starts up again, its really scary, i am afraid it is causing hardware malfunctions in long term. this has happened dozen of time now.

2) sometimes i leave the computer alone a while, i come back and i notice ctrl+alt+del doesnt work and winlogon.exe is using 100% of one of my 4 cores.

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Most likely you have a virus. Here is a link to some information:

Good luck, Regards,

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just wondering, why my antivirus wont recognize it then? using f-secure internet security 2011. i've scanned whole computer many times and nothing found – Neeb Nov 6 '10 at 15:12
many viruses now use rootkit technology to bypass detection once inside. i have had to use killbox to remove processes that are hooked into explorer/winlogon. if you want to do the virus scan reliably, slave the drive into another PC and scan that way – RobotHumans Nov 6 '10 at 15:22
unfortunately i cant do that... and i cant definitely delete winlogon.exe since its used by windows. suggestions? – Neeb Nov 6 '10 at 15:34
@neeb: I would also download Microsoft Security Essentials - and Malwarebytes - and do complete scans with them. – Xavierjazz Nov 28 '10 at 17:09
Those are pretty good, but if it's a rootkit you'd be out of luck. I recommend running GMER( first. – Jeff F. Jan 14 '11 at 21:47

Another possible solution if it's not a virus(though it sounds like TDSS to me). You can repair system files by going to the start menu -> run
Type CMD
Press Ok
Type SFC /scannow


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I had winlogon.exe causing an error message and reboot at system startup, but only on maybe 50% of boots. No virus or similar found.

I realised it had started soon after I installed Oracle VM Virtualbox. I deinstalled this and problem has completely gone. Virtualbox does something clever with network connections/cards - I believe that's what caused the problem

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