Nvidia have released a new beta driver that includes a fix for black screen problems with Windows Media Center. The problem seems to be affecting a few people in the Windows Expert Forum and seems to be caused by the last driver update. If you have the problem you can get the new driver from Nvidia
Release Highlights
New in Version 285.79
Includes several bug fixes and performance improvements for Battlefield 3.
Fixes cases of irregular performance (stuttering) primarily seen on DirectX 10 GPUs. The fix improves the performance of both DX10 and DX11 GPUs.
Fixes shadow map corruption seen with DirectX 10 GPUs.
Fixes cases of black corruption lines/triangles with DirectX 10 GPUs.
Fixes black screen during playback using Windows Media Center.
Added or updated SLI profiles for the following games:
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This has drove me mad I thought it was an issue with the hardware