Windows 7: Nvidia gtx450

Hey guys i recently instaled my windows 7 and i lost alot of my files now ive down loaded all my drivers again but im having HUGE fps drops in games like Team fortress and minecraft to 1-5 fps
A friend said Its because i havent disabled my onboard graphics would this be why?
Also if it is how do i do it?

Onboard graphics is disabled via your BIOS. Typically, this will be accessed by pressing DEL when you boot your computer (Before it starts windows). On some factory built computers it might be F1 or F2. Reboot your computer and watch the information on the screen that is displayed before windows starts. It will usually tell you what key to press.

Need a litte more information than just "Gigabyte" for your mobo. If you can tell us the model it would be easier to point you in the right direction. If you still have your mobo manual, it will also tell you how to disable onboaard graphics.

You might also like to check that you have the latest drivers for your gtx450 (available at Drivers - GeForce)