The best answer is to go to Consumer Reports Magazine and look up the answer. They did a recent look and comparison of the various anti virus software. There are many Excellent anti virus, but, no system is perfect. There are some very good anti virus software that is free. You might also go to CNET .com and look at what they say in their reviews of down loaded anti virus software. That's Consumer Reports Magazine, and CNET.com. Both can give you a very detailed answer to your question. Just because a product is free does not mean it's bad.
Kingsoft Free Antivirus is the "very powerful antivirus", i have used before.i have tested most av programs but for me this one is clearly the best we will be friends for a very long time i think^^
i recommend u to install an anti-virus software which is free for our user
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