My GMA 4500MHD chipset boasts DirectX 10 support and OpenGL 2.0 capable. I’m wondering if maybe this graphics card is designed to work with Direct3d more than OpenGL, or if its just a bad graphics accelerator in general.
Don’t expect high performance out of your 4500 on any API. Intel’s drivers tend to work better with Direct3D rather than OpenGL on Windows. Their (open-source) Linux drivers also tend to be better at 3d than their Windows counterparts (more extensions etc).
One question: have you installed the latest drivers from Intel’s site? If not, you are getting Microsoft’s OpenGL emulation driver that renders either in software or via Direct3D emulation - and you really don’t want that.