Hi. Today the pc (win 2000, avast + firefox) got a prob. Avast segnaled a viral infection while the boss (I wasn't at office; he said me via phone) was surfing; he scanned, found many stuff (dunno what precisely; he's ignorant about pc stuff......), erased 'em, but after restart, firefox icon on taskbar desappeared, and appeared on the desktop; but he wasn't able to fire it up.
Any exe's now won't start; they give errors. Tried to install some remedies, but the pc won't start the exe's (even msie, dxdiag and system resources won't start). And there's a recurring blip in background.
What happens? How to get rid of this problem?