Method 1.
Now you have to stop the Windows Media Player Network Sharing Service and check for the issue, to do that you need to follow the steps provided below.
1. Control Panel -- Administrative Tools -- Services. Find the Windows Media Player Network Sharing Service, open it, click on Stop to stop the service.
2. Close Windows Media Player 12 if it is started.
3. input %USERPROFILE%\Local Settings\Application Data\Microsoft\Media Player\ to Windows Explorer to find the folder.
4. Move all files in the folder to another place as a backup.
Note: Move files in the specific folder will reset database.
5. Restart Windows Media Player to see if we can add files to Library now.
Method 2.
1. Click on Start and in the search bar type cmd.exe
2. Right click on cmd.exe and click on Run as Administrator
3. In the command prompt type the following command
net localgroup "Administrators" "NT Authority\Local Service" /add
4. Press enter and restart the computer
Method 3.
Uninstalling and Reinstalling the Windows Media Player:
Step 1.
Uninstalling the Windows Media Player:
1. Go to Start and in the search type "Turn Windows features On or Off".
2. Click on "Turn Windows features On or Off".
3. Browse to the Media Features and uncheck the mark in front of Windows Media Player.
4. Restart the computer
Step 2.
Reinstalling the Windows Media Player:
1. Go to Start and in the search type "Turn Windows features On or Off".
2. Click on "Turn Windows features On or Off".
3. Browse to the Media Features and place a check mark in front of Windows Media Player.
4. Restart the Computer.
Try playing the file now.
