Critical Update for Windows XP Service Pack 2 Firewall

If you use a dial-up connection, you must install this update on your Windows XP SP2 system.

Description of the Critical Update for Windows XP Service Pack 2: "After you set up Microsoft Windows Firewall in Microsoft Windows XP Service Pack 2 (SP2), you may discover that your computer can be accessed by anyone on the Internet when you use a dial-up connection to connect to the Internet."