Try following:
- Start regedit (Start->Run-> and write “regedit”)
- Find key “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\OpenGLDrivers\ati2dvag”
- Change DLL value from “atioglxx.dll” to “atioglx2.dll”
It seems like that ATI driver update installs wrong OpenGL driver for (9800/X800/?) AGP cards. Changing registry value solves this problem.
This solution is coming from: OpenGL programs will not start by “tcowher”