Originally posted here by h3r3tic
Do what sysmin said, here are a few firewalls:
http://soho.sygate.com/buy/download_buy.htm
http://www.zonelabs.com/store/conten...eeDownload.jsp
www.kerio.com/us/kpf_home.html

edit
no problem sysmin, we shouldn't have to find it for them anyway.
Another good, free firewall is Agnitum Outpost. http://www.agnitum.com

There's a free and paid version. The free version should be enough.