Well, I wasn't having this exact problem, but perhaps my solution will work anyway.
I had the "couldn't load OpenGL Subsystem" error, and figured out that the new nvidia drivers weren't completely removing all the old drivers (at least that's the way it acted).
Here's what I did, maybe it'll work for you:
Install an old set of drivers (I used 21.83, you can get them from www.geforcezone.com
Then install the newest ones again, and reboot. Then try running the game.
If this doesn't work, I don't really know what to tell you.