Agree about AVG sadly. It's almost too scared of anything and regularly gives False Positives.
I use Avast on XP and Windows 7 and it has stopped Viruses on websites, and previous AVG 'scares' are not a problem with it.
I don't work for Avast, but do feel their free version is the most reliable I have used.
Just my two-penneth.
Cheers, MP.
PS. Still haven't got CoD, maybe in Six-Months
