ZoneAlarm Free Firewall
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Full user review
"Simply the Best"
I'm that guy who everyone calls for help with their computers. If I don't see I firewall, and usually I don't, the first thing I do is install zone-alarm. Its free and dependable and I've been using it for several years.
The best thing about this firewall is the easy to use program control, letting me know if a program has changed and letting me allow or deny it access to the internet seamlessly without tricky manipulation.
Every time you update a program it will ask you to let it thru, you cant have this level of security without a little repetiveness.