Don't feel dumb. Computers are not everyones gig. I have even come across one that I could not fix...too bad for that one...it became spare parts

If its just that one file giving you problems now then why not just get rid of it? Then install maybe a little bit newer anti-virus program...do a scan...if clean..defrag and all shoudl be good.

Sounds to me like you almost got the problem *licked*.