Guys,
thanks for the friedly welcome
@watchthisspace
using XP, the virus was flagged by Avast when using Ad-aware scanning and showed up in c\programfiles\opera75\profile\cache4\opr001F9.exe. Though I think it would have been completely harmless sitting in the cache, I followed the Avast advice and put it into the chest. When rerunning the scan, the same thing happened but this time the alert related to: c\sytem volume information\restore....
As mentioned before, this pc is seldom used, has no email set up and sofar has been clean. I have since checked out TDS-3, Spybot and Ad-aware without any alerts and a new scan with Avast does not show anything either. I am a bit baffled
The opera cache no longer shows the file and I can't even find a folder c\system volume information... Might have something to do with restore points in XP?
@ Gyl - thanks for that link - will have a look at it tomorrow
@ Eddy - Vgrep was what I had looked for though in this particular case it does not provide much further info