Dec 212009
Good free antivirus. I’ve used it for years without any problems. The interface is a bit more complex than it probably should be. You must register once per year (free).
Main site: http://www.avast.com/
Download: http://www.avast.com/eng/download-avast-home.html
Register: http://www.avast.com/eng/home-registration.php
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A nice feature is the ‘boot time scan’. It allows a virus scan (and removal of viruses) before Windows starts.