avast! Free Antivirus
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Full user review
"Does what it's supposed to do. no more. no less."
Works quietly, does the job, isn't a resource hog, and is FREE. Lots of improvements over v.4.x, including easier registration (no more email keys being mailed).
No cons on this product.
Somebody please explain to me why you'd spend upwards of $100/year to keep a PC free from the bad stuff - when there's this lovely, FREE product out there that does exactly the same thing?