Avast Home Edition
A newer version of Avast Home Edition is available.
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Full user review
"Friends & Neighbors love it!"
Free for home use
Doesn't hog system resources
Maintains itself easily
Avast is part of the clean-up regime I use whenever I work on a friends/neighbors PC. (Avast + Firefox + Thunderbird = they rarely have to call me again to fix their PC!)
Only thing I don't like and this is really minor, is having to re-register it each year.