Vista 64 Media Center Crashes on Program Start

I have Vista Ultimate 64 bit. My machine had been running fine for a
while now. But Monday when I tried to use my Xbox 360 as an extender,
which is what I do every single day, it showed the connecting screen,
then just stopped at a black screen. I went to the computer and tried
launching Media Center from the desktop and it crashed right away with
the following error details.

Media Center has stopped working

Description:
Stopped working

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: ehshell.exe
Problem Signature 02: 6.0.6001.18000
Problem Signature 03: 47919e0e
Problem Signature 04: Microsoft.MediaCenter.UI
Problem Signature 05: 6.0.6000.0
Problem Signature 06: 480ebd70
Problem Signature 07: 33ba
Problem Signature 08: 0
Problem Signature 09: System.NullReferenceException
OS Version: 6.0.6001.2.1.0.256.1
Locale ID: 1033

I have been absolutely loving my Vista Media center and can't stand
having to use my cable provided dvr. Any assistanced would be greatly
appreciated. Thanks!

As another side note, Media Center is still recording scheduled shows.
And I can watch them in Windows Media Player. I just can't open Media
Center on the desktop or through the XBOX 360