Click Start, type turn windows features on or off
Hit Enter
Expand Media Features
Uncheck Windows Media Player
Click OK
Restart when prompted
Click Start, type turn windows features on or off
Hit Enter
Expand Media Features
Check Windows Media Player
Click OK
Restart when prompted
Try playing again.
If the problem persist:
Click Start
Type: CMD, from the results, right click CMD
Click 'Run as Administrator'
At the Command Prompt, type: sfc/scannow
This will check for any integrity violations
Restart your system