Installed the recommended driver for the VGA

Hello, I’m using laptop ASUS A42JC with VGA NVIDIA optimist that can be switched to on board if the add on VGA is not needed. I have dual boot operating system with Windows 7 and unbent 10.10 Maverick installed in the laptop. I have no problem with the VGA with Windows 7 but the real problem lies in unbent. I have installed all the needed drivers but the only driver not installed yet is the VGA driver. I have received recommendation from unbent. So I did install them, and as usual after installation completed I restarted the laptop. After restarted, I cannot use unbent GUI only can access terminal. I'm confused I thought I installed the recommended driver for the VGA but why did it fail?
