Here's a comparison of aftermarket firewalls.
http://www.matousec.com/projects/fir...ge/results.php
Zone Alarm Pro had a good rating. I didn't see any test of the free version. I use Online Armour on one PC and McAfee on another, I see McAfee rated as useless. Hmm.
This begs the question. They don't show any results for XP or Vista firewalls. DOes this mean they would fail these tests completely? Well Consumer's Reports says Vista is not good for blocking outbound trojans.
http://blogs.consumerreports.org/ele...oft_vista.html
BTW, when using a 3rd party firewall, you have to turn off the Windows firewall.