Windows Messenger Kill 
Old Way
Start > Run- type- C:\WINDOWS\INF\SYSOC.INF Substitute your Windows directory if necessary (ie D: or C:. This will open a text file that maliciously hides some programs from the Add/Remove Programs folder. Find the line that starts with msmsgs= and edit the word hide out of it (Do NOT remove the commas). Save the file, open control Panel?s Add/Remove Programs and click on the Windows Components button. Scroll down and you will find Windows Messenger just waiting to be unchecked.
New Way
Run- type:
RunDll32 advpack.dll,LaunchINFSection %windir%\INF\msmsgs.inf,BLC.Remove
You can just copy and paste, just make sure to get from R to e without the extra space that pops up at the end when you highlight.
Ill Advised Way
Aka- Merely disable Messenger >>> Start > Control Panel > Administrative Tools > Services. Find Messenger in the pull down DISABLE it. Then hit STOP then OK.