I had great luck with McAfee for 15 years if I ever got the rare virus I could call them and they would actually get on my computer (remotely) and do whatever it took to get rid of the problem. Very good customer service.
A lot of people like Norton, but I just found the program to be more intrusive than I wanted to deal with. It had to scan all emails, etc etc etc
I know that the people who take the time to set it up and use it as described get the benefit of it - but I just never found it to be intuitive for me.
I have been naked with just AVG for a few months now, though, and no problems.