Vista fix
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Open up My computer from the start bar.
Nav to C:\Windows\System32\cmd.exe right click on it and run as admin.
Then type sfc /scannow once that is done it will restart.
From that point download ZapMessenger this can be found on google.
Install it and run it once this is done download and install Windows Installer Cleanup Utility.
http://support.microsoft.com/kb/290301/en-usRun the utility and select all windows live based entrys after this is done install msn again.