vertex shaders

[Jackno1]

The game did not start on my machine. It said "Error! ... no Vertex Shaders found" or something like that - In the error log something like this was displayed: "Could not find a working profile for cg file"

For me it solved the problem when I uninstalled ALL NVidia Drivers on my system (Mainboard & GraphicCard), cleaned the registry and reinstalled the newest available Version of the Drivers (WinXP32 Forceware 169.32 and Nforce Driver 6.86). Maybe it also functions by removing only the GraphicCard Driver...

After rebooting the game started well without any problems.

My System:
NVidia XFX 8600 GTS (256 MB)
Asus A8N-E (nForce4 Ultra)
AMD Athlon 64 X2 Dual Core 4200+
Windows XP Professional SP2

I have the same problem.
For me, this solution is not working. :S And i cant install Forceware 169.32, because its not support my videocard (the installer says) and not let me to install it. For my videocard (8800gt) the newest driver 169.21.
Before i read this post i knew that the driver cant be the problem because 8800gt is a pretty fresh card and i download the driver when i bought it and not install from the driver cd(wich was in the box with the card). Plus the game(penumbra overture) is far oldest then my videocard.
So i really want to know whats the real problem.<_< Cus its sure not my 8800gt or its driver!
I download the latest overture patch, and the latest OpenAL too, but nothing changed. :S
8800gt owners cant play the game??? :S Or whats the prob? I think the game not recognize my videocard. It can be? :S
With my old videocard(1950pro) i didnt have this problem. It worked fine. :S

Pls help me.

Conf.:
Abit ab9 (P965)
C2D E6320
2x1gb geil ultra
inno 8800gt (512mb)
Windows XP Professional SP2