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Hello, my name is Bobby. Thank you for the question. Typically when a window starts moving slow followed by it not functioning at all any more it is due to a bad window motor and regulator. As the motor fails it becomes slower and slower until it can no longer move the window at all. The assembly will need to be replaced. Most shops would charge about $300-400 to do this. I hope this helps. Let me know if you need further assistance.