My experience with the power windows is the switch gets gummed up or corroded.
Just use a small screw driver to pry the switch out of the door arm rest. Take the switch apart ( be carefull because the little "ears" are fragile) and clean the contacts. Careful not to loose the little balls.
I can't remember but on the 740 if the A/C compressor goes bad it blows the fuse and the windows are on the same fuse.Do they all not work from the master switch or not at all?
See if the fuse for the windows has power.