Xbox 360 controller setup

[md01965]

Hello,
I just install my Xbox 360 game controller Razer Onza) for PC, now everything is calibrated and I try to use the controller to play game online but it those not work. Do I need to do additional setup to play online with the controller

 

[hang-the-9]

Is the game compatible with the controller? If it's a PC game it may only work with the mouse and keyboard.