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Independant comparisions have shown that Kaspersky (
http://www.kaspersky.com/) detects more than Norton does, and is far quicker than Norton at detecting new viruses.
http://www.av-comparatives.org/ for comparisons.
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Those comparatives are a bit useless since they test on a gazillion of very old viruses. How quick the programs are to catch new viruses is more important. Of course if the program misses a tonne of the old ones you should ditch it, but most shouldn't.