Av
Any modern AV will have an overhead, some worse than others. Norton has been historically the worst but they say their newest version 2009 is much improved but I will never recommend Norton AV to anyone.
Grisoft.com has a free version AVG that is very good but it is buried in their website. Search their website keyword "free" or goto download.com and search for AVG there. Excellent FREE AV for home use.
I manage our corporate AV of about 150 seats. Sophos.com, excellent product. I would recommend it for any company with more than 10 computers.
Keith
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