GDI Generic renderer


i’ve got a tablet with the Intel Z670 Processor and the GMA 600 graphic card. After I installed Windows 8, I can’t play OpenGL games anymore. I always get an error that OpenGL isn’t available. After using GLView I found out that for some reason my the renderer used in windows 8 is ‘GDI Generic’ from Microsoft, and not the igdogl32.dll.
How can that be? The driver is the same as I was using in Windows 7. The igdogl32.dll is listed in HKLM/System/CurrentControl/Control/Class/{4d36e968-e325-11ce-bfc1-08002be10318}/0000/OpenGLDriverName.

Any ideas?