launch Windows Messenger and Tools -> Options.. -> Preferences
uncheck the checkbox for "Run Windows Messenger when Windows starts
this should prevent Windows Messenger from starting when Windows starts... otherwise, you can disable it using any startup mananger and disable Windows messenger to run at startup...
to uninstall Windows Messenger... and is provided by DjLizard:
a similar topic can be found here: http://forum.CCleaner.com/index.php?showto...123entry14123