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If you use Linux, BSD, or to a lesser extent, Mac, you don't even need an anti-virus. With that said, all anti-viruses are not that good as a large number of professionals suggest to re-install windows if you find viruses. This is becasue for every virus you find there will be about ten more you have not found; they are like cockroaches. If you don't believe me you can test it youself. Install and scan a computer that haves multiple viruses with several different anti-virus software. You will notice each one finding a different set of vituses. Anti-spyware, another thing Linux and BSD don't need to worry about, is the same way.