Unable to start

So I just reinstalled GW after a long time and a few hardware changes, now it won't start. Since my last install I have gotten a 7800gt. When I attempt to start the game I get an error that reads "Unable to initialize 3D output. Pleace veryify that you have installed directx 8 and an updated video driver". Both of these I have done. I downloaded the most recent version of my video driver and DirectX. Any help could be appreciated.