At this point the latest drivers we have for your graphics controller is for win 7 32 bit. You can try installing this driver but we do not guarantee that it will work on win 8. You can get it at the following link:
Checking the model that you have, it seems that the manufacturer has developed drivers for win 7 32 bit only. My best recommendation is to try installing the driver provided above but if issue persists, you may need to downgrade the OS to the supported version.