AVG Anti-Virus Free Edition
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Full user review
"The best free antivirus program available today."
Simple to use. Very Powerful anitivirus software. Has email included. Most comprehensive package availabel that is free.
Missing a few bells and whistles but they are available in the pay version. Not really anything critical but nice to have none the less.
You cannot go wrong with AVG Free it is my first install on every new computer I build. 5 stars!