It's Windows Media Player fault. I had that couple of months ago (with sh3 and 4 too)
but unfortunetly i cant remember how i have fixed this. Maybe try (1) to update your wmp to newest version, (2) turn off dx acceleration in wmp settings, (3) update directx, (4) try other graphic card driver (if any of the above fails).
Hope it will help you somehow.
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- improved with GWX and...too many to list them here 
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