Open the Windows Media Player Library troubleshooter
If your computer is having problems accessing your collection of digital media files in the Windows Media Player Library, try using the Windows Media Player Library troubleshooter to fix the problem. The troubleshooter makes sure Windows Media Player is correctly installed on your computer, and checks to see whether your Player Library is corrupted.
To make sure you have the most up-to-date troubleshooters from the Windows Online Troubleshooting Service, your computer should be connected to the Internet. For more information, see Troubleshooting in Windows.
Open the Windows Media Player Library troubleshooter by clicking the Start button , and then clicking Control Panel. In the search box, type troubleshooter, and then click Troubleshooting. Click View all, and then click Windows Media Player Library.
For more information about the Player Library, see Getting started with Windows Media Player.