[roadracer311]

This is the usual symptom for a failed window regulator. If you search for that term, you'll see some tutorials on what they do when they fail and how to replace them. Try the easy stuff to diagnose it, but 99% chance, you need a new window regulator. People have tried to repair them, but no one has come up with a fix that lasts. I have a failed on in my closet right now. Next time one of mine fails, I'm rebuilding it, using parts from my old failed one.