Click Start –> Run.

Paste the following:

RunDll32 advpack.dll,LaunchINFSection %windir%\INF\msmsgs.inf,BLC.Remove

Click ok.

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Note: If you have service pack 1 installed, you may receive a message telling you that there was an error unregistering the OCX 16422.  Just click ok--windows messenger will still be uninstalled.