Try manually installing the latest DirectX 9.0c runtime, and make sure your graphics drivers are properly installed and up-to-date. Sounds like you have other graphics-related issues with your computer.

EDIT: Heh, nevermind the first part - just saw you've already tried that. In that case, something is seriously wrong with your graphics card's drivers or hardware, because installing DX9 should be very straightforward. Try reinstalling drivers, make sure the card is seated properly, and that your displays are connected to the discrete GPU and not the motherboard's onboard graphics chip.