In my opinion, Norton is only good for keeping Tylenol stocks in the black...
We have been using Avira and Avast. They pee in my Wheaties when I turn my computer on in the morning- SUPER slow, and the free versions have pop ups, Grrrr!
However, I love Firefox with lots of add-ons, and Avira has caught some viruses that Avast did not catch on another Firefox computer in my household.

I love Firefox's WOT so far, but am disappointed that anyone can buy their way to a good rating.

I am a picture clicking geek, and get lost in about everything I can on the web, so virus protection is important to me!