[Kong]

If you are using Windows 7 (other OS are similar) then go to the Control Panel. Select Devices and Printers. Your controller should be listed there. Select it and click properties. You should be able to test that the buttons are working.

If it is not listed there or not working, then it is a problem with Windows, your controller or USB. If it is working there then the problem is with the game.

Either way, first step is to make sure it is plugged in. If that doesn't help then reboot.