For those Media Center 2005 users that are still using Media Player 10, Microsoft released an update to address Windows Media Player 10 automatic update failures after installing Update for Windows XP Media Center Edition 2005 (KB913800).
You would need this fix if you see the following symptoms:
The Windows Media Player 10 automatic update does not complete. Additionally, you receive the following error message:
A more recent version of Windows Media Player is already installed.
Note This issue also occurs when you click Check for Player Updates on the Help menu in Windows Media Player 10.
Microsoft, technology, Media Center, Media Player