Reinstall them. The error you are having usually is a result of a bad driver installation. If the drivers however are fully intact, try performing the test for your video card in the direct X diagnostics application. dxdiag -> Graphics tab
If you can't get it to pull up any of the D3d test and Direct x and your video drivers are installed correctly, the problem might be hardware related. A nasty thing to think I know but I had a similar problem at one time, and my gpu was toasted, hopefully that is not the case for you though. I would suggest attempting to reinstall your graphics drivers though to make sure everything is intact.
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