Programs seem to stop working after you install Windows XP Service Pack 2 - 842242

842242 - 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. "

To help provide security for your Windows XP SP2-based computer, Windows Firewall blocks unsolicited connections to your computer. However, sometimes you might want to make an exception and permit someone to connect to your computer.

After you install Windows XP SP2, client applications may not successfully receive data from a server.

Alternatively, server applications that are running on a Windows XP SP2-based computer may not respond to client requests.…

http://support.microsoft.com/default.aspx?kbid=842242