AVG often conflicts with a large number or programs. Just use Avast free edition, rated by PC World as the best free antivirus for the past 4 years in a row. (no, I don't work for them, but I use it on all 500-odd computers that I manage.)
I use Antivirus software once a month.Im behind 2 firewals.
Once a moth i download & burn on cd a scanner,wich then scanns my entire hdd.
Its kinda knopix/ubuntu like.
So far,so good.
"Your words are powerful; write carefully, with precision and meaning. Use them to nurture, not destroy." - Jools Noctru of the Order of Krath