Hi,
Do you have checked the event logs? You may reset or restore Windows Media Player and then check it again.
Here are artilces can be referred to.
Fix Windows Media Player video, and other media or library issues
http://support.microsoft.com/mats/windows_media_player_diagnostic
Reset Windows Media Player 12 To Default Settings
http://daily-grind.net/reset-windows-media-player-12-to-default-settings/
Repair Windows Media Player with Fix WMP Utility
http://www.thewindowsclub.com/repair-windows-media-player-with-fix-wmp-utility
Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Ivan-Liu
TechNet Community Support
