Don't rule out anything yet. Try this. Open a door so the interior lights come on. Ign on, engine off. Look at the interior lights very carefully while hitting the window switch for one of the good windows. You should see the light flicker ever so slightly. Now try one of the bad windows. If it does the same, then it is a regulator or motor most likely. If it doesn't flicker the same as a good window then it is an electrical (switch, wire, etc) problem most likely. When looking for an electrical problem on the rear windows remember that the front OR rear switch could be the problem.

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84 500 SEL (307,xxx miles)