Trying to play Mass Effect on TinyXP partition, problems galore

I finally installed XP on boot camp and I was hoping to be able to play some of my PC Steam games. However, when checking if I could run the game with "Can You Run It," I came to find that the site wasn't able to detect my video card. Neither was Dxdiag. It wasn't even listed.

I tried running the game anyway, seeing as how I was in the green in every other criteria Can You Run It checked, but I got an error message saying this:

"Failed to compile global shader FDOFAndBloomGatherFallbackPixelShader

RaiseException() Address = 0X7c812aeb (Filename not found)
CxxThrowException() Address = 0x7815e89 (Filename not found)
GMatrix2D::Swap() Address = 0x10da7b63 (Filename not found)
Address = 0xe871b4c (Filename not found)"

I called the Mac people and they suggested that I needed to install Boot Camp's updates (I was running on 3.0, so... twice). Did that, rebooted (twice) and launched the game again.

Same error message as above.

So I'm a little confused. I've read posts from other people who claim that they can run this game with my very specs without any problems. On Boot Camp, with TinyXP, and I don't know anything about drivers so I don't know what I'm missing.

Can anyone help me out? This is practically the only reason I set up an XP on my mac.

I'm running everything on a 2010 Macbook Pro.