Once upon a time Norton was the best thing around and McAfee wasn't too bad either. But like previously mentioned, they have become HUGE resource hogs and I don't recommend their usage anymore for the average PC user.
Like some others here, I've been using Grisoft's AVG (Free Version) for a couple years now and I also DID finally buy it. It's been worth it.
My
Rick Wilson aka CorpRebel
