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#11
I've looked at a lot of different tests concerning AV's, and they all have their own opinions on which one is the best. In 20 different tests you easily find 20 different results.
The best AV is the one you trust, keep updated and run on a regular basis.
Keeping all your programs up to date with the latest patches also helps ( I use Secunia for this).
And a little common sense when browsing the web.