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Uninstall Windows Messenger from Windows XP
How to Uninstall Windows Messenger from Windows XP
Step 1:
Shut-down Messenger if it is running.
Step 2:
Click the Start button, then click Run.
Step 3:
Type:"
RunDll32 advpack.dll,LaunchINFSection %windir%\INF\msmsgs.inf,BLC.Remove" and press OK.
Source