Hackintosh Not Using Nvidia Drivers

Hi All,
My Hackintosh won't boot up with the Nvidia drivers for some reason. After installing the drivers and checking the option to use the Nvidia drivers (not the OS X native ones), I restarted and when I checked the Graphics Drivers in System Preferences, the OS X Native Drivers were selected instead of the Nvidia ones.
Side Note: My Hackintosh doesn't boot up when I add the bootflag "nvda_drv=1", but it does boot up if I leave out "nv_disable=1"
Please Help!