Reboot the machine. Terminating the process, especially if it was hung, did not communicate back to the part of OneCare that provides the interface information that it was ended. And, if Tune-up hangs again, please contact support.
How to reach support (FAQ) - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
-steve
Microsoft MVP Windows Live / Windows Live OneCare & Live Mesh Forum Moderator