If you looking for a free and powerful personal firewall,here i recommend you this free personal PC firewall ‘Privatefirewall‘.Before that Privatefirewall is a shareware cost USD 29.95 but now is free.
Moreover,it also offers everything that you expect from a personal firewall, including Packet Filtering, Internet traffic (packet) filtering, port scanning, IP tracking, SecurePOP email protection, and a proprietary Application Control Engine, which monitors all applications that access the Internet. The program integrates with the Windows Security Center, and offers a choice of 3 different profile settings for at home, at work and on the road, which makes it especially interesting for Notebook users that frequently connect to other networks.
Download Privatefirewall 6.1 and supported Window 2000/XP/Vista/7.
Don’t miss it .