Avast Free Antivirus
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Full user review
"Excellent Product. No Viruses in over 3 years."
Since using this product, I haven't had a virus - period. That represents over 3 years. I have 10 computers in my office. All are Virus free for that period of time.
Always updates itself at boot up time. Sometimes this causes a delay in what I immediately want to do. It pretty well sucks up the resources while downloading. But that's probably less than 60 seconds.
I wouldn't trade it for any of the others at any price.