If the motors are running chances are the rubber coupling connecting the motor to the regulator has cracked and broken. They're cheap and easy to replace. One of my windows was out of its track and had been wedged at the top to hold it in place. I have no idea what happened to it. It hadn't worked in so long and the motor had got wet, so it was rusted up. I took the motor apart (really easy) polished and lubed the shaft, put it back together (really hard) and it works great. I pulled the regulators and tracks out (something of a Chinese puzzle), cleaned and lubed them, replaced the rollers and they work great. Good luck.
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