You'll need the "sgx_drivers_r2.pnd" linked
HERE, and follow the instructions.
Once installed, run it from the "System" menu and select a 1.6 driver.
After that you can run Hydra Castle with graphic.
For some other games maybe you'll have to change again the driver version, and most of the time the "default" one (1.4) is ok, but not in this case.