Strange graphics bugs.

[Pehmu]

Ok, I just finished Overture and decided to install Black Plague. I installed the 1.01 patch as well.

The annoying thing is that I have all the same bugs in Black Plague that I had in Overture.
Here, take a look: http://img357.imageshack.us/my.php?image=bpng2.jpg
My friend told me he has all the same graphics bugs in Overture, but Black Plague works great on his PC. He has a GF 8800 GS and I have GF 8800 GT. They're pretty close to each other technical wise, but I really don't understand what's causing these bugs.