The problem that I found with Norton is that it wants to take over every system in your computer. I did not like its invasiveness.
I use McAfee & haven't had any problems yet (fingers crossed). The only problem is that it is a little expensive if you buy the upgrades they offer, so each time they ask me to upgrade I go to ebay & buy the latest version for one quarter the price - this should keep you going for a couple of years.
Allan