Hi Empty...this is what i've found floating around the internet for you...
Generally, when AGP texture acceleration is unavailable it will be either because the motherboard chipset drivers haven’t been loaded or because drivers were loaded in wrong order. I’d suggest you try the following:
• Uninstall the display card from Device manager. Uninstall any related driver entry you might see in Add/Remove programs. Reboot and cancel out of the hardware detection dialogue.
• Install the most recent
motherboard chipset drivers available for your motherboard. Reboot.
• Install the most recent driver available for your graphics card from the
3DLabs website.
• Update DirectX to the latest version. (Or reinstall DirectX)
That should hopefully do the trick. AGP texture acceleration unavailability usually results because the AGP miniport driver (part of the chipset driver set) hasn’t been installed correctly.
hope it helps