Also, check that you have Direct X still working. Rebuilds can sometimes mess up that. Follow these easy steps:
1)Start >> Run - type dxdiag
2)Menu should load, this will post all of your video and sound specs, extremely useful.
3)Video tab, do all of the video tests.
4) At the bottom it will say save all information, do that. I think you can copy and paste that information here. Please do not attempt to upload the file itself, and be sure to look through that to make sure no sensitive information will be posted.
Good luck.