Hey Thanks for giving more Info.

You need to First disable the LW Player. Go to Tools > Options > Player. Uncheck the Box and Click Apply and OK.

Now to make WMP your Default Player.
Go to your Shared Folder on your HDD. To do this...While in the LW Library, click Explore (Lower Left Part of the Screen). Once the Folder has Opened, Now Right Click Any File. Highlite "Open With" and click Choose Program. Click on WMP. Now Check the Box...Always use this Program...Then OK.

If you have No files on your HDD, WMP should become your Default Player once the LW Player is Disabled.
Hope this Helps.

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