Windows Media Player comes preinstalled on most Windows operating systems, including Windows 7 and later and Windows Phone, as of 2015. Users of older operating systems, such as Windows XP, can download the app for free from the official Microsoft Windows website. Windows Media Player is not compatible with Windows RT operating systems. Though Microsoft does not offer a player compatible with OS X, Apple users can download QuickTime plug-ins for Windows media files from the website.
If you have an operating system with built-in Windows Media Player but it is not functioning correctly, you can check for downloadable updates on the site or attempt to repair the program by reinstalling it directly through the operating system. To reinstall the player, enter “appwiz.cpl” into the Start menu search form, and select the Program and Features option. Select the administrator option to turn features on or off from the side menu. Under Media Features, find the box for Windows Media Player and deselect it. Confirm the action in the pop-up window.
Restart your computer to deactivate the program, and then follow the same steps to access the Program and Features window. Recheck the box for Windows Media Player, and confirm the selection in the pop-up window to reinstall the software.