Some programs seem to stop working after you install Windows XP Service Pack 2
After you install Microsoft Windows XP Service Pack 2 (SP2), some programs may seem not to work. By default, Windows Firewall is enabled and blocks unsolicited connections to your computer. This article discusses how to make an exception and enable a program to run by adding it to the list of exceptions. This procedure permits the program to work as it did before the service pack was installed.