If your desktop is frozen...how can you check Winlogon usage of the CPU? If your desktop is not frozen, then you can easily check the status of any process, including Winlogon.
I don't know much...but it hardly seems likely that any user would ever be able to see Winlogon taking 99% of CPU cycles, unless something really atypical has occurred.
How long did this 99% for Winlogon last? What were you doing just before this occurred?
Are you using a firewall?
Do you have an AV program installed, updated, and running?
What programs do you use to scan your system for malware/spyware, etc.?
Interesting read: http://www.velocityreviews.com/forums/t215...inlogonexe.html
More interesting: http://aumha.net/viewtopic.php?f=62&t=32614
Thanks. My recommendation would be that you post this (or link to this) at BleepingComputer.com - Am I infected What do I do - http://www.bleepingcomputer.com/forums/f/103/am-i-infected-what-do-i-do/
Edited by hamluis, 05 August 2008 - 11:16 AM.