Windows Media Player 12 is included with the Windows 7 operating system, as of 2015, but those without it can reinstall the player through the Control Panel. Windows users with the Starter, Home Premium, Professional, Ultimate or Enterprise edition of Windows 7 should already have this program installed.
If Windows Media Player is missing or not functioning properly, it can be reinstalled. From the Control Panel, users should select Turn Windows Features On or Off. If the box beside Windows Media Player is clear, users can simply check the box, exit and restart the computer. If the box is darkened, users should clear the box, exit and restart, and then return to this area, check the box and restart again. When using Windows Media Player for the first time, users can configure it to associate the appropriate file types and designate it as the default player for media files.