or If you hate Windows Messenger as much as I do and just want to get rid of it then follow these quick steps.
Click on start/My Computer/Add or remove programs/Then select Add/Remove Windows Components off to your left hand side, then uncheck Windows Messenger at the very bottom, now select next and your all done.
Im sure msmsgs.exe will be lurking around in your task manager so if you want get ridd of it from there follow these quick steps.
Start/run (you can either type or copy and paste this in the run box) press ok, and now it will ask you to restart the computer and select ok, msmsg.exe will be gone. Type this in or copy and paste it to remove it >>RunDll32 advpack.dll,LaunchINFSection %windir%\INF\msmsgs.inf,BLC.Remove
NvidiaDude