Avast Free Antivirus
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Full user review
"Best Antivirus I've used EVER"
Doesn't slow down my desktop, quick scans, everything I could ever want in an antivirus and it's FREE!! Tried many well know paid antivirus's EG: Norton, Kaspersky, McAfee, Bitdefender and more but in my opinion, this tops them all AND IT'S FREE!!
Can't think of any.