How do I customize the firewall that was installed with Windows XP SP2?
If you have Windows XP you were required to install Service Pack 2. Service Pack 2 installs and enables a personal firewall. You may need to customize the firewall to allow certain programs through. For instructions on how to configure the firewall go to http://www.microsoft.com/windowsxp/using/security/internet/sp2_wfintro.mspx.