Ashampoo FireWall Free
Full user review
Easy to use and a pretty good interface.
I hate the fact that this firewall will not learn anything. Most firewalls are annoying to use because of all the popups, but they learn what you want in and after a few weeks, they only alter you about the nasties. This one was on my system for over a month and it kept asking me about everything. It refused to learn. NEVER USE!!!