This is a little tiny tweak to allow any windows media player skin to become transparent.  However, it is made possible with Nvidia.  Nvidia has a nView option with some of the latest drivers.  It is with this that one can make their windows and stuff  transparent.  When one right clicks a button in the toolbar you have a nView choice.  You do not have this option for windwos media player unless you do this:

1. Set your media player to Classic view.

2. Right click the windows media player button on your toolbar, choose nView and select transparent.

3. Change the skin again to your favorite.

4. The new skin should remain transparent unless you close WMP or reboot.

5. Enjoy