Microsoft automatically installs Windows Messenger and also makes it very difficult to uninstall.
Steps to Disable Windows MessengerClick the <Start> button
Click <Run>
Enter the command "services.msc"
Click the <OK> button
Find Messenger in the services list and double-click on it
Change the Startup type to Disabled
Click the <Stop> button
Click the <OK> button
Uninstall Windows Messenger
Alternatively, instead of disabling Windows Messenger, you can also
uninstall Windows Messenger.