Beta Issue

I just wanted to leave some feedback in trying out the Beta 1. Currently the game appears to work great up until the main game starts. It generates a new world and then everything goes black. I see the feather pointer but nothing else and the video driver keeps failing and recovering.

EVGA nVidia 8800 GTS 320 Mb - driver version 185.85

OS : Windows Vista 64 Business

Ram : 6 GB

Processor : Intel Core i7 920

I can send you a file with all my video card information if needed. I can't think of anything else you might need.