Having Problems Installing Alien vs Predator Gold

Hey guys, I was wondering if you could help me out.

I recently installed AVP Gold Edition on my computer (for old times' sake), but weird things keep happening every time I play it.

The most glaring problem is the right third of the screen is completely black, and leaves traces of lens flare from the lights.

I'm using Windows Vista, and when I install, it says I need DirectX6 to do so, yet it offers me a chance to install said program.

Any Tips?