First, check that the window lock switch is not pressed. It is on the drivers door next to the four power window switches, it has a little picture of a door and window on it with an X through it. If the switch is pressed, only the driver can open and shut the windows, the switches on the other doors will not work. If the windows won't work at all, not even from the driver's door, make sure the fuse for the power windows is good. Replace it if you don't know how to check it, fuses are cheap.