All four windows stopped working at once

One of two things. First the master switch on the driver side died (unlikely) next, you lost power or ground to the switch. Wires break. Open the drivers door. Look to the front, you will see a rubber boot going from the car to the door. This is usually where the wires break. Just a note. When they break here, I solder a wire to the car side and run it into the door side, cut it in to the appropriate wire. trying to fix them in the jam is a real pain and doesn't last long.