used both Kaspersky and AVG, and without meaning to offend anyone, they stink.. AVG in particular, the only reason people think it's good is that it blocks anything that look even remotely suspicious, good luck trying to get torrents past AVG, not a very pleasant business.. Kaspersky is good as for as AV goes, but that is only if u have it constantly updating, if a new breed of intelligent viruses hits your PC, you're fried.. If you want the best of the best and u don't want it free, I'd recommend ESET SmartSuite, it is THE BEST antivirus software out there, nothing, and i mean NOTHING with bad intentions gets past NOD32, brilliant heuristics, incredible way of handling malware; couple it with the antispyware capabilities of SmartSuite and you're safe from harm! and if it is not allowing something you know with 100% surety is safe, getting it over NOD is a simple matter of a few mouseclicks. Highly recommended software!