"please explain more clearly…

"1) the PC freezes, or avast awaits a user/response ?

By freezes i mean it announces the virus, stops scanning,a nd awaits my instructions

"2) Why would you want to deep-scan mpegs at all ?
they can’t presently be malicious…

I don’t, no rational person would want to. i simply selected thourough scan, all hard disks, and avast decided to do it on it’s own

"try setting the scan options properly…

Ah… I would if I know how… any clue

TIA

–G