slam dunk contest

does anyone know what buttons to press in slam dunk contest, nba 08 4 pc.

It depends what you want to do. That's a pretty generic question.

i just wanna do a regular dunk, what button or buttons do i press

Combo of the shoot button, dunk, pass, hop step will get u different dunks. It is very hard to time using the keyboard, i don't know about game pads, or other controllers, but it is very difficult to pull of dunks other then the basic ones.

I'd recommend utilising the Slam Dunk School (found under Game Modes) to get the basics down.