Problems with Open GL on windows 2000 with a TNT2

Hi everyone. I have boucth a TNT2 card. i can run OpenGL. but everything is very dark and i can hardly se a thing in this games. it has nothing to do with my monitor settings. Direct3D works without darking down the screen. but all games cant be runed with Direct3D. when i run OpenGL on other computers it doesnt get this dark that i hardly can se a thing. anyone who can help me? anyone that knows any program for configuring the lighning in OpenGL?

Thankfull for help=)