I have the same problem. I'm on Win XP Pro SP2 (with all the patches and fixes) and with latest Avast version and no spywares according to Spybot and MS Anti-spyware.
It happened a couple of times over the last 2 weeks, but most of the time while my computer was doing nothing. No program running, except Firewall and antivirus. The computer was even in lock mode. So I didn't know what caused this. I thought maybe heat or something.
I checked my event viewer log as you specified and found this in the Antivirus log:
Sign of "Win32:Trojan-gen. {Other}" has been found in "D:\System Volume Information\_restore{C7FAA5EB-E355-4E7C-B8A6-BDE82E70E516}\RP372\A0075174.exe" file.
Event ID: 90
Type: Warning
Source: avast!
The time of the event is about 20 minutes after I locked my computer. I went back to my PC about 1 hour 30 minutes later and avast GUI service had crashed.
I tried to scan the folder, but I didn't have access to it. So I gave myself the rights to access it. Scanned it using the right-click and found:
Win32:Trojan-gen. {Other}
Virus/Worm
0536-2, 2005-09-07
Did the same thing for my C drive and found it too.
I disabled the System Restore and re-enable it to clean up all the crap. (7.5 GB!
)
I also found in the system log this thing:
Sign of "Win32:Trojan-gen. {VC}" has been found in "C:\documents and settings\ayumi\local settings\application data\pixoria\konfabulator\popcheck mail checker mk2.widget\popcheck mail checker.widget\contents\retrieve.exe" file.
I think my problems started when I install konfabulator. I installed it 2 weeks ago. Uninstalled it and deleted the directory 5 days later, but I still had problems 10 days later.
I'll keep you posted, if this fixed my problem or it still continues.
Sorry for the long post.