Norton sucks, it destroys your PC with all it's bullsh*t "Updates" get Avira Antivirus, and AVG, both are free
I suggest using Avira (Premium) and/or NOD32 Security Suite. They are both very good and efficient on resources
Norton and kespresky are great but slow machines down alot. Nod32 is the best i think. it used to be free but i think you pay for it now. but its still worth it
I use AVG Elite, and for my other PC Kaspersky, it is fantastic, here's a little information on them http://tech.yahoo.com/blogs/null/82713 Code (markup):
Mcaffee and norton.. hmm.. at least get something free; Avira Antivirus (less load, i like it), and AVG AVAST or get Nod32 (used in the past, also less load), and Antivirus software - BitDefender
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I use AVG and Avira at the same time, just because it's free and they really are the best free antivir imo