OK guys you need to find a 3rd party driver to find what kind of GPU you have. Try going to run and type in dxdiag and find your graphics card and google it.
if you cannot install that driver and over ride, then you can force it by going into the device manager and go to the graphics/ display (not sure what its called) and click update driver
then browse for drivers and then let me pick from on my hard drive and then specify the driver and over ride it. if it gives you this driver is not digitally signed go ahead and say install.
**NOTE** its probablly smart to create a restore point prior to installing the drivers. just sayin..
hope it helps