That's exactly what I did last night, reinstall direct X 8, uninstalled ASUS video driver, downloaded latest nVidia, reinstalled audio PCI driver.
All the 3d apps give me the same thing: a window with the name of the app in the border, the inside of the window is white, and I have an hourglass cursor in there which I can move. I have to reset out of it. Looks like it might be the video card.
Everything was working fine after I initially installed the audio drivers. Since then, 3d apps have stopped working (gradually). Wouldn't this argue that the video card is the problem? What else does it suggest?