Yeh I used to use the Avast/ZoneAlarm coupling and it was
very good indeed.
Peter Norton hates John MacAfee and vv, but more likely its
W7 screwing things up. After you clear that possible issue I'd
stick to only one AV program on one puter and not two.
I've been a Norton user myself for yonks, but MacAfee I hear
is just as good.