I had the same problem on Python 2.6.4 64-bit, PyOpenGL-3.0.1b1, Windows 7. Turned out there was a 32-bit glut32.dll file in the PATH, which was used instead of the correct 64-bit glut32.dll in Python26\Lib\site-packages\OpenGL\DLLS. Everything worked once I cleaned the PATH environment variable. You can download a 64-bit version of PyOpenGL for Windows at <http://www.lfd.uci.edu/~gohlke/pythonlibs/#pyopengl>