Avast Free Antivirus
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Full user review
I've been using it in compatible mode along with another anti-virus. I like it better in compatible mode because it's not too aggressive, yet it keeps my PC safe from infections and rootkits.
If you know what you're doing then it's safe but if you don't, you can really mess up a few programs that Avast sometimes mistakes as viruses. :)
I like avast so I'll keep it in my PC and even recommend it to my friends. Thanks, Avast!