Let's not forget the flash vulnerabilities (one is currently ongoing) that let baddies slip through a reputable site's ads. An antivirus is always a good idea.
And free =/= virus. I use the free version of AVG and haven't had issues with it.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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