OpenGL error on Win7

I recently upgraded my computer from Windows Vista to Windows 7. Now, whenever I go into OpenGL mode, the video doesn't show up! I hear audio, but I see just a black screen. BTW, OpenGL worked perfectly on Vista. Anyone else have this problem or a solution to it?

I suggest doing it in Windowed mode, from personal experience. Except I have a flickering screen and massive slowdown when in full screen.

Do you have the right graphics drivers installed?

Follow Callum's advice, reinstall the drivers for Win7.