Originally Posted by BomberAF
DO NOT USE windows firewall as it is hopeless, it is only a one way firewall, and on top of that it may as well not be installed.
Use PC tools firewall,it's free and does the job of any paid for AV Firewall.
Actually, I believe the firewall included in XP SP3 is two way. It's still not great, but it's a *lot* better than it was.