Avast Free Antivirus
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Full user review
"Terrific product, and the price can't be beat!"
Works perfectly on my Windows 7 computer. Updates definitions several times a day. Rarely intercepts a program and hardly ever gives a false report.
None that I have experienced to date.
I've been using Avast for several years, on multiple computers, and love it. The fact that it's free makes it spectacular.