I use AVG, and am very happy with it. It runs fairly lean and finds and stops alot of stuff. I don't like Nortons, as I say...because I am impatient and it is a bit of a resource pig.
You do also want on top of a good anti-virus, to have a back up anti-malware program, but one thing at a time. You shouldn't be on the internet period without anti-virus.
