I was using Norton Anti-virus for the longest time, thinking it was doing it's job because I was never detecting viruses during regular scans, but then one day I actually got a virus that started fucking with my Google search results, a false page that'd occasionally produce spam links instead of real links.
I came to GBAtemp asking for help, I've since ditch Norton in favour of Avast and Malware Bytes, much MUCH better software that immediately detected viruses that Norton was oblivious to.
Although after a false-positive fiasco that flagged a lot of my software as infected, I've switched to MSE.
Point is never use Norton, ever. Three big offenses are that its virus scan actually doesn't pick up shit, it slows the system down to hell, and worst of you, you have to PAY for that.
Why do you think they give Norton away free with computer systems? It's the only way they can move their shit, onto unsuspecting customers!