It is problem that when you play videos using windows media player you can hear but cant see anything.
If you can temporarily fix the problem by shaking the window or maximizing or minimizing the media player window or overlapping it with other windows, then you should update your video card drivers with the latest one from that you get from your video card manufactureswebsite.
Fix:
If this doesn't help, you have to download the Window's support for video overlays until you can play the videos properly.
If this doesn't help, you have to download the Window's support for video overlays until you can play the videos properly.
In WMP click tools from the menu then goto performance tab, and click the advanced button to display the video acceleration settings tab. Then deselect "Use overlays" box, click OK, and try playing the clip. If this doesn't work come back to the tab and deselect "Use video mixing render" check box.