I've heard of Antivir but like the others I use AVG free, AVAST is equally as good in my opinion, the only reason I use AVG is its the first one I used. Both AVAST and AVG have a very small effect on resources unlike some antivirus programs. I've been using AVG for perhaps 4 or 5 years now, perhaps more and as long as you use a bit of common sense when surfing it will keep you virus free. Pick one and try it, don't like it, delete it and try the other one.
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