I'd personally suggest anyone really looking in to AV software right now, even if it's not "free from a vendor," check out:
http://www.av-comparatives.org/images/stories/test/performance/performance_dec_2010.pdf
It does include AVs such as Norton (FWIW: after being around computers since literally 1990, and having worked several IT positions, trust me when I say do NOT use Norton).
Personally, I find Avira to be much more responsive and trustworthy, although now it seems like a newer product K7 is the king. I'll have to find a "demo" for it.
http://www.av-comparatives.org/images/stories/test/performance/performance_dec_2010.pdf
It does include AVs such as Norton (FWIW: after being around computers since literally 1990, and having worked several IT positions, trust me when I say do NOT use Norton).
Personally, I find Avira to be much more responsive and trustworthy, although now it seems like a newer product K7 is the king. I'll have to find a "demo" for it.
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