Alienware M15x, Windows 7 Ultimate, nVidia

Hello,

A couple of years ago, I purchased and Alienware M15x, I have not had problems with it until recently, which I was forced to clean the hard drive, and re install Windos 7 Ultimate. After that I downloaded the drivers, when I got to the nVidia drivers it said "No nVidia hardware detected, Installation will now abort". So I did some research, and came to updating the BIOS, which I also did as well, and on the other forum it said that the hardware will show on the BIOS, well it doesn't. It is NOT showing up on the BIOS I installed the ATI Mobility Radeon HD 5730, then my computer is HD again, but when I wanted to play a game I realised that I do need the nVidia driver, I uninstalled the ATI mobility Radeon and attempted to install the nVidia, which my computer came with nVidia GeForce GTX 260M. Does anyone have any solutions? I also want to know what all drivers a recommended after re installing Windows 7 Ultimate. I refuse to contact Dell and pay 300 for installation of drivers.