Try this quick walk through:
Fix A Corrupt Windows Media Player Database
First thing that needs to be done is to stop the Windows Media Player Network Sharing Service. This service controls media sharing over your network but it also locks the database file so it can’t be deleted by the user.
To stop this service enter task manager (crtl+alt+del) and select the services tab.
Find “WMPNetworkSvc” in the list then right-click and select “Stop Service”.
If you receive a denied error you can also stop the service from the “Services” button at the bottom.
Open Windows Explorer and go to “\Users\YOUR USERNAME\AppData\Local\Microsoft\Media Player”. It may be hidden but you can enable hidden folders to be shown on your pc by going to Control Panel > Folder Options and enabling showing hidden folders.
Once you’re in the folder, locate the “CurrentDatabase_371.wmdb” file and delete it. If you receive a permission denied error the “WMPNetworksvc” may not have been stopped or you may need to restart your machine and start again.
Once the wmdb file has been deleted, restart Windows Media Player and the database should begin to repopulate.
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