AVG has a great reputation, and I used it myself before going back to Norton. I did this because I also used to use Zone Alarm firewall - also well thought of, but on my XP machine, an update really screwed it up. The guy who builds my machines said I should have asked him as he knew of issues with Zone Alarm and XP. He talked me into going back to Norton, and now am on Internet Security 2009 and very happy. The licence also covers three machines, so for £11.50 a year for my desktop and two laptops, I think it is great VFM too.
Funny how mud sticks. A while back, Norton had a reputation for being resource hungry. That has been fixed for some time now, but I found it quite sad that they now incorporate a CPU meter split between system use and Norton use. Strangely enough, it always shows Norton uses less resources than the system. But then, if I were Norton, I'd make sure it did that too
They obviously think that their reputation for hogging resources is not being reduced even though that was in the past.