Playing Modern Warfare 2 with Xbox360 game controller for PC

Hi

Can someone please explain how to use xbox360 game controller for the PC to play MW2?

I downloaded pinocle and installed the software for the controller and still doesnt work.

Is someone using xbox360 controller for PC to play MW2 and how did they install it and get it to work for multiplayer?

Please put simple step by step instructions on how to get this controller working.

Thanks heaps guys!

Peace