1991 Lumina Power Windows DESPERATE!

1991 Chevy Lumina APV apx 180000.

Problem is that neither passenger nor driver side power windows work. There is no sound and seemingly no response whatsoever when the control is pressed on both sides. Fuses have been checked, as has prelim wiring. Both windows worked in the morning, and then both were dead 8 hours later after school. Do not have the money to go have it looked at and repaired, but need the windows working for summer with the AC broken! Any suggestions? (Have already checked fuses, some wiring, lubing the rubber, etc) Power locks still work fine.

Thanks so much for your help!