I've used both Avast and Antivir. IMO i think Antivir is better because of the clean interface, its impressive detection rate, heuristics, and the general lightness of the program. The only bad thing i see in Antivir PE is the updating but it's not that bad for me b/c i have a 6mbps connection. Most people disagree and say that Avast is better. Why? They say that in general, Avast has spyware detection... But Avast has a lower detection rate. I do not think that the web shield is that good either. It sometimes is incompatible with some software too. If i have a virus, Antivir is going to catch it anyways. Is it because of bias? Which one is truly better?