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winlogon.exe+0x39156 thread uses 50% CPU

Posted on 2007-11-25
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Last Modified: 2010-04-21
Hi,

I've found out that the winlogon thread [winlogon.exe+0x39156] uses 50% [or little less 49.90...].

The workstation seems to be clean from spyware, worms or viruses. The winlogon.exe is the right one [from XP SP2].

If I kill the thread, it reappears after a second. The only "strange" [except the 50% cpu usage !]  thing about this thread is the amount of context switching [about 300 per seconds].

Does someone have any idea to solve it ?

Thanks
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Question by:asap-tfolliot
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by:orangutang
ID: 20346669
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r-k earned 1000 total points
ID: 20346839
Could be a corrupted user profile. Try logging in as another username and see if that makes a difference (create a test user if no other username exists).

Below is my checklist for this sort of problem:

This could be due to number of reasons. Among them:

(1) Hardware malfunction
(2) Malware or rootkit
(3) Corrupted user profile
(4) Misbehaving AV or other service or driver.

I would suggest the following:
(a) log-in as a different user - does the problem persist, if so then rule out  option (3) above.
(b) Disable any AV program or anything else unnecessary and see if that helps.
(c) Run Process Explorer from http://www.microsoft.com/technet/sysinternals/ProcessesAndThreads/ProcessExplorer.mspx 
    It shows a lot more detail then Task Manager. In particular, if it shows CPU
    time being used by "Interrupts" then there might be a hardware problem.
(d) Scan your system for malware. At the very least, run the following two programs:
 (d.1) RootkitRevealer from: http://www.microsoft.com/technet/sysinternals/Security/RootkitRevealer.mspx
 (d.2) Download and run HijackThis from http://www.hijackthis.de/
       Copy-and-paste the resulting log back to that same web site (not here)
       Click on "Analyze", and then click on "Save Analysis" at the bottom of the next page.
       Review for anything unusual.
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Author Closing Comment

by:asap-tfolliot
ID: 31410870
Hi,

The user profile was corrupted. 1st time I encounter this behavior with a corruped profile.

Thanks for your help !
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by:orangutang
ID: 20347323
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