Quick Tip: Free online antivirus scans

CNET Editor Tom Merritt shows you how to give your PC a quick check-up with online antivirus scanning.

There's a time and a place for giving your PC the once-over with an online scan. CNET Editor Tom Merritt explains when and why you may want to supplement your full-time antivirus software, and offers up some good destinations for making a quick system sweep from the Web.

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