Messenger live crashes without error message.

The problem is that when i press the now playing button to enable it messenger crashes instantly without any error message. And when i try to delete messenger from control panel -> remove program it just gives me an message that says "key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer\UIPlugins{0776F107-F5A6-404B-9A78-7027FA6EAADD} cannot be opened. Make sure you have privileges to use the key, or contact supportstaff." I have admin privileges but still it gives me the same message. And when i try to use the repair option it just gives a message that a "serious error happened during installation". Hope you can understand because i´m finnish and have obviously finnish os.