Thanks, I'll try to check tonite (it's on my GF's PC, as usual...).
Oh, due to a lack of internet connection she couldn't update Avast for the last 2 days, maybe the solution is already there but she couldn't check it due to lack of update.
Still it sounds strange that Avast finally detected UFO, but only removed it from the pendrive, not from the PC...
It just bothers me I'll have to waste 1 more day of my time removing this virus, I bet she won't be able to use any online AV systems, nor install Ccleaner, F-Secure Blacklight, HijackThis, Ewido and everything else. -_-'