i had so much trouble wif mine. questions to clarify:
1) do the button lights switch on? if not, check the black box under your steering wheel, just above where all the fuses are. If you give a hit, it should work temporarly, but i recommend changing it. (wreckers) 2) Whch windows don't work? are they just dead? problems vary from a blown windows fuse (no. 5, its a bit bigger than the other ones) to the window motors..
hope it helps, but mouce is spot on, you should be more detailed.