Dirts McGerts

I uninstalled KOTOR2 and reinstalled it, and tried playing without the patch. My computer can play the game, I meet all the minimum requirements. However, whenever I try to start the game, nothing happens. It seems as if my computer is loading and about to start the game, then nothing happens. Can somebody please help me out here?

When I run "Configure" on the menu screen, the game says I pass everything except my video drivers are apparently out of date. I have checked again and again, they are up to date and working fine. It also says that "NVidia cards require Detonator 45.23 drivers or better". When I try to run the game, it seems as if its loading and about to run, but nothing happens, not even a black screen. Here's some system info: Operating System: Windows Vista