Avast Free Antivirus
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Full user review
"Probably the best malware protection!"
Not slowing down computer.
Fast scans (especially in 8 version).
very good total protection (signatures & other technologies that block undetected malware when executed).
Easy for pc novices.
You should reenter email after a year to renew the free license.
Between all free Av's and a lot of paid, Avast free provides better protection. AV testing sites are not always representative of what really happens. I've used it for several years and did not have any problems with malware. I mean it, I am not of those who believe they are malware free and in fact have plenty of malware in their systems.
Get it from here :D