Game flickers at specific camera angles when shadowes enabled.

[Da-Huntha]

I've got the same problem. In addition to flickering to black it also flickers to my desktop or the main menu when I've opened that.

Computer Specs:
OS: Windows Vista X64 Ultimate SP1
CPU: AMD Athlon 64 X2 6000+
GPU: EVGA NVidia GeForce GTX 295 (Single card SLI, On Multi-GPU Rendering)
Drivers: 186.16
With Dual-Monitor set-up, though my second one is disabled.
RAM: 4GB DDR2

I've ran Overture and Black Plague on this PC with the exact same settings fine. In fact, I ran Requiem right after beating BP.
I bought the Steam version.