Virus I Think - Help Required

[zipadeedodah]

This afternoon my computer keeps coming up with a message saying "This system is shutting down. please save all work in progress and log off. Any unsaved changes will be lost. This shutdown was initiated by NT Authority/System"

After searching on the net, it is clearly caused by some kind of virus. Aparantly it is causing lsass.exe to terminate, which then triggers the shutdown. A virus scan has not found any virus's, however one thing was identified, which said:

File: ntoskrnl.exe
Result/Infection: Change
Path: C:\WINDOWS\system32\ntoskrnl.exe

It didn't identify this as a virus, but there's something about it not right I assume.

Any help on this would be greatly appreciated....I really don't know what to do/how to get rid of it.

Thanks very much!

[RATTER15]

Just do a restore to the day before this problem first occurred.

[mushroom25]

the "sasser" worm causes symptoms like this - download & run "stinger" (from McAfee) or similar if you think you've got it.

[mattie]

As soon as your PC has booted up, click start, then run and type cmd and click ok.

At the prompt type "shutdown -a" with out the quotation marks and hit enter.

Then go to the microsoft site and update your PC, also run a virus scan.

[zipadeedodah]

Thanks for your help - hopefully it is sorted now, will wait and see!