I kind of got sucked into purchasing Norton AntiVirus 2011 because it is so inexpensive on ebay (about a buck/month) and tests so well. First paid AV I've used in several years after giving up NOD32. It seems to have "0" impact on performance and am quite satisfied with it in that regard so far. What I don't like about it, unless I don't have it set up correctly, is I don't believe it alerts during or after definition updates. I've never had an A-V that didn't. I asked on their forum how to find out what definition it's at and the only response was checking in app data files. Can that be right? I'll check the tutorial tomorrow to learn more.