Avast Free Antivirus - Best Free Antivirus

I first encountered Avast Free Antivirus around year 2005 when I got my first computer. As I can remember it was the avast! 4.6 edition. During that time I don't have a comparison yet between other free antivirus so I decided to try other products. I picked a famous free antivirus from AVG then tried it for a month. But I was not satisfied so I switched back to Avast again. Then another popular free antivirus named Avira gets my attention, I tried it and somehow liked its interface. But later I got bored with it because it seems it's not doing

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