I suggest gettting AVG when your norton expires in my opinion its jsut aas good and easier to use, also get Ad Aware SE its great for spyware and adaware) im pretty sure norton does this 2 but to protect you from viruses over the net or anywhere it will have an instant pop up when a problem is brought up with a few simple options
-delete virus - Quarantine - ignore -heal
theres alot of threads like this, i got AVG Free 4 my anti-virus, Ad-Aware SE Personal, Spybot S&D, SpyBlaster 4 my anti-spyware, Ewido 4 my anti-malware, and Windows Firewall.