[RWilson2526]

http://www.microsoft.com/windows/win...ultplayer.aspx

you could try this

To set Windows Media Player 11 as your default digital media player

1. Open Control Panel.
2. Under Pick a category, click Add or Remove Programs.
3. In the Add or Remove Programs window, click Add or Remove Programs.
   
4. In the Add or Remove Programs dialog box, click Set Program Access and Defaults.
   
5. In the Choose a configuration box, double-click Custom.
   
6. In the Choose a default media player area, click Windows Media Player, and then click OK.
   

You also have the option of setting Windows Media Player as the default digital media player for one or more specific file types rather than for all audio and video file types that the Player supports. For more information, see How do I make Windows Media Player the default player for a file type?

In some cases, you might set Windows Media Player as the default digital media player for a specific file type but a different player or program opens that file type instead. For more information, see Why is a different player or program opening my audio and video files when Windows Media Player was set as my default digital media player?