avg is one of the best anti-virus software programs there is
personly i don't use it , i use xoftspy anti-virus it is not free but it is well worth the money it is easy to use and it covers spyware and viruses
http://www.paretologic.com/products/...yse/index.aspx
i've been using this product for a few years now and i would have to say it is never done me wrong
avg is ok one of the better ones out there but if you dont mind spending a little bit of cash each year this one is good
that or there is nod32 that has been voted the best but personally i think it is well over priced