Avast Free Antivirus
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Full user review
"Fabulous, let's make that idiotic 10-characters minimum"
Free, very easy.
I was turned on to avast! quite by accident and so far am extremely happy with it. If it indeed slows up my system, it's not by much. However, after resetting my PRAM, I received an "Internal error!" popup with a suggestion that opening the program or searching the system logs might provide "more info." Neither did and I remain in the dark. I'm hoping this resolves itself; other than that, I couldn't be happier about finding avast!, especially since the Norton program I was given by Amazon to review was a total bust.