Based on your post, there's the strong possibility the crash affected some registry entries and the Media Center is now damaged.
The possibility that a clean install using the software provided by the vendor/manufacturer of your computer may be the only alternative you have to fixing the problem.
Consequently...I'd recommend backing up any important images, files, documents, folders, etc., etc...andperforming a clean installation using the recovery software provided by the computer manufacturer.
However, you may want to wait for further assistance from other mebers of this forum, before continuing. I am almost positive, though, that a clean install is probably needed here.