In past we have covered three freeware tools ZapMessenger, WLM DeepClean & WLMUninstaller to uninstall & remove windows live messenger. Most of the WLM uninstaller utility uses CLSID but since the key is different for each WLM version such a solution might only be useful if you have that exact version.
Here is yet another Windows Live Messenger uninstallation & removal tool which uses windows installer & CLSID to completely remove & uninstaller WLM. Windows Live Messenger Uninstaller v0.01 can effectively remove any version of WLM.
Windows Live Messenger Uninstaller tested with Window Live Messenger 14.0.8089.726 on Windows 7.
Windows Live Messenger Uninstaller