Avast Free Antivirus
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Full user review
"Fast, efficient, and best of all FREE"
Easy to install. Doesn't bog down my system. User interface is easy to navigate and understand. Not a constant drain on my wallet with 5 computers in the house.
Latest version has individual registrations rather than a single multi-computer license. (Personal preference, not really a con.)
I have been using Avast on all the MS-Windows computers in my house for many years. I've tried other company's free offerings, but have found none that keep me happy like Avast. When people ask me to recommend an anti-virus program, this is the one I recommend. I consider this product to be superior to some of the commercial products on the market.