Hi,
a. What happens when you try to delete the files?
b. Do you get any error?
This issue can occur if the directory where Media Player stores data may contain corrupted files.
To resolve this problem, clear the Windows Media Player database. To do this, follow these steps:
1. Exit Windows Media Player.
2. Click Start, click Run, type %LOCALAPPDATA%\Microsoft\Media Player, and then click OK.
3. Select all the files in the folder, and then click Delete on the File menu.
Note: You do not have to delete the folders that are in this folder.
4. Restart Windows Media Player.
Note Windows Media Player automatically rebuilds the database.
If this does not resolve the problem, clear the Windows Media Player database cache files. To do this, follow these steps:
1. Exit Windows Media Player.
2. Click Start, click Run, type %LOCALAPPDATA%\Microsoft, and then click OK.
3. Select the Media Player folder, and then click Delete on the File menu.
4. Restart Windows Media Player.