Microsoft KB article on removing messenger
Microsft has releases a knowledge base article(Q302089) on preveting MSN messenegr from running on a windows XP machine. This article describes how to prevent Windows Messenger from running. By default, Windows Messenger is installed by Windows XP Professional and Windows XP Home Edition, and the user interface does not provide a way to remove or to uninstall Windows Messenger.
The information in this article applies to Microsoft Windows Messenger 4.0, Microsoft Windows Messenger 4.5, and Microsoft Windows Messenger 4.6 running on Windows XP Professional and Windows XP home edition based computers.
Click here for the article.