Hello.
I've been getting the same error message: D3DERR_NOTAVAILBALE , it started about a month after changing the Video Card form ATI to Nvidia.
I did try a few versions of drivers, including non official... results remain the same (and did change the power source to a better one).
Also did try to play in windowed mode, but the game crash anyway, however with a diferent message, relating to the board itself (can't remember it correctly, and I'm at work right now)
Quite probably I will give up and downgrade for my old video card... at least I still can trust that one.
ps.: I have installed SPs up to FT, patched. If it is of any relevance, the erro occur's with or without custom content.
Sorry for the bad english... not my first language (obviously)