Update your Hercules 3D Prophet 9700 video card with the latest drivers.
Note: Please make sure to uninstall your previous drivers before launching this update.
For that, go in Windows Control panel, enter in "Add/Remove Programms". Then uninstall "ATI/Hercules Control Panel" first. Don't reboot when prompted. Then uninstall "ATI Display Drivers" or "3D Prophet RADEON Series" and reboot when prompted.
Here's other similar drivers that are different versions or releases for different operating systems: