Going through the same issue myself, I'm going to replace the windows soon anyways, because one doesnt work and the other needs extensive help to come up.
Does your dash lights dim if you hold the vert windows up or down? If so, it probably isn't the switch since it is pulling power. The bushings in the motors tend to take a **** in these cars so that could be an issue too, which just is $7 a side at your parts' store.