Question : Freeware Firewall software

I am looking for a light Freeware open-source firewall software that I can install and give me the ability to set rules and polices.

I would like it for example to set a rule to block all incoming/outgoing traffic on all ports and only allow Firefox to communicate on port 80.

this is easily doable with premium firewall softwares however I have tried ZoneAlarm free but if I want to set rules it ask me to upgrade.

 is there anything light and freeware for XP, Win7?

Answer : Freeware Firewall software

http://support.microsoft.com/kb/813878/en-us  <--- via ipsec


alternativ:

Ports Lock - English

A personal firewall for Windows NT/2000/XP that fully supports user-level security. Once Ports-Lock is installed, administrators can control which users can access what TCP/IP based protocols (HTTP, FTP, SMTP, POP3, Telnet, etc.) on a local computer, depending on the time of day and day of the week. PortsLock lets you set allowed/denied TCP/UDP ports and IP-addresses for incoming and outgoing connections.
http://www.johannrain-softwareentwicklung.de/smartline.htm#ports-lock-en

and also done with the win firewall in  xp:

http://www.manageengine.com/products/desktop-central/help/computer_configuration/configuring_windows_xp_firewall.html