Unverified signatures for windows files & drivers!?

[mindbug]

Hi,

When I plug in a usb flash drive windows xp will notify me that I'm about to install an unsigned driver. Kinda strange because the driver is supplied within windows itself. I ran Process Explorer and Autoruns from sysinternals and noticed that the digital signature of almost all windows processes could not be verified. I performed a sigverif and it found thousands of unverified system files. on some machines I found malware and removed it and on some I didn't find anything malicious. If the malware is cleaned out the problem stays.

The tried running a checkdisk and a sfc /scannow with no results
The only way to fix it is to do a repair installation of xp.

I've encountered this problem on several xp machines and it's beginning to annoy me so I wonder if any of you guys have seen this problem too?

I'm tired of doing a full repair install cause everything else seem to work so If there is a better and/or easier fix I would love to hear it.

I started a thread on the sysinternals forums with no solution so far.
http://forum.sysinternals.com/forum_posts.asp?TID=17112&PID=85155#85155

Any help would be greatly appreciated!

thanks,

[seedubya]

Just read your other thread. I just had such a problem here with one of my own machines. Everything was fine until I installed a trial of some antivirus that I can't rememeber the name of. Shortly after that it started identifying system files as virus infected. Virus Total found nothing. I still couldn't quite believe what had happened so I did a repair install. As soon as I re-enabled the AV the same thing happened. Nothing to indicated anything in the logs and Virustotal was still clean. Never found a solution and ended up doing a clean install.