Yes you can, but you have to install a Driver in which I do not know where to.
I don't believe you can use the PS3 Guitar Hero controller on the PC to play anything
It's not about the Game a PS3 controller is designed for the PS3 as a Bluetooth wireless controller that was not designed for the PC or supported by windows software or hardware.
You will need to search for a PS3 to PC driver. After, connect your PS3 to your PC with USB.
Can't.
No, Modern Warfare 2 on PC doesn't support the PS3 Controller.
No, there are no PS3 -> PC emulators right now, however you can connect a PS3 controller to your PC.
no
you get a cable
Well, according to http://news.filefront.com/how-to-use-a-ps3-controller-on-a-pc/ , you must install a driver in order for your PS3 controller to work on your computer. From there, you can simply plug in your controller and then run ZSNES. ZSNES should regard your PS3 controller as a joystick, or whatever the driver assigns the PS3 controller. However, according to some comments on the above page, you may have some difficulties getting the controller to work with your PC...
To connect a PS3 controller to a PC you need to download a program such as MotioninJoy.
no it's notNo it is not
no