Windows 7: Loading drivers via Win 7 disk boot

Hey. I'm trying to install Windows 7 and having some issues. Here are the details:
I'm installing the official MS downloaded 64-bit build 7100 RC (released May 5). I'm installing onto an Athlon 64 X2, 4 GB RAM, etc. I have integrated graphics card that I'm using to get it running, before trying to get my ATI 4670 to work. The int. graphics card is an ATI X1250 chip.

When I just boot it, everything loads fine, but the Windows screen is mostly white with black lines through it. You can see where textboxes are, but not what's in them. The mouse cursor is fine throughout. So, I figured my drivers were just bad.



So, I tried to load the system via the Windows 7 boot disk, then go to the Repair Windows option. This all works fine and the screen looks normal. I open up the folder with my drivers (downloaded directly from Gigabyte today), and select my .inf file. It brings up a list of drivers to install. I click on my chip (again, the X1250), and it loads for a bit before saying the driver failed to load. So, I don't know what I'm doing wrong here other than just being SOL. Any thoughts?