I tried a few times to fix Media Center Studio after updates release by Microsoft broke parts of its functionality. There was several threads on the Green Button forum about renaming .dll files or replacing them with blank ones and changing security permissions, which sounds like an easy way to give yourself a headache. None of these fixes seemed to work for me, I also tried a patcher program someone had released but still my Media Center Studio was busted.
Then a user on the Green Button forums kindly gave me a link to MCSFix.exe you can see the thread here. You need to create a shortcut to the MCSFix.exe in the startup menu. Or if you don’t reboot often you could create a scheduled task for it to run every hour or so.
So far its been working for me and my customised Media Center menu’s have remained in place.