Copy and paste the following to a text file, and save as RemoveMsgr.bat

@echo off
RunDll32 advpack.dll,LaunchINFSection %windir%\inf\msmsgs.inf,BLC.Remove
@echo REGEDIT4>%TMP%\RemoveMsgr.reg
@echo.>>%TMP%\RemoveMsgr.reg
@echo [HKEY_LOCAL_MACHINE\Software\Microsoft\Outlook Express]>>%TMP%\RemoveMsgr.reg
@echo "Hide Messenger"=dword:00000002>>%TMP%\RemoveMsgr.reg
@echo.>>%TMP%\RemoveMsgr.reg
regedit /s %TMP%\RemoveMsgr.reg

• Close all Internet Explorer windows.
• Run RemoveMsgr.bat, When prompted, click Yes to close all affected applications.
• Restart your computer for the changes to take effect.

You are done ..