Originally Posted by Corwin 
I grabbed the Steam version cheap and it works perfectly on Win 7 64 bit.
You're using an ATI card, right?
This thread got me curious, so I spent the last hour trying to get Gothic 2 Gold (Gothic Universe retail version) running on Win7 64bit.
No luck… It seemed fine at first, but as soon as I try to leave Xardas's tower, the graphics become corrupted, and the game slows down to less than 1 FPS.
A quick search comes up with the opinion that you can't run G2 in Win7 64 if you have an nVidia card.
I also tried what Ergonpandilus suggested on the previous page, but neither of those patches would install for me.