Avast Free Antivirus
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Full user review
"Free runs out, and very difficult to remove."
The only thing I can think of is when you turn on your PC it telles you that your antivirus has been updated automaticly.
Couldnt hardly figure out how to get it off of my computer when it said your free virsion would expire in 10 days.
To many popups wanting you to buy the full virsion, I think thats why they make it so hard to remove from your PC