Avast Free Antivirus
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Full user review
"On my PC's, my Mac, and my Android phone."
Configured properly, it is an amazing defense against malware of all sorts.
Slick new user interface.
The Boot time scan has helped me fix more infected computers then all other AV programs... combined.
default settings are still a bit relaxed.
The best AntiVirus money doesn't even have to buy.