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Your window problem could be the motor or the regulator. It will take a little more investigation to determine which it is. You will have to take the door panel off and visually inspect the regulator for obvious damage and watch it try to operate to see if anything is jamming it. That's probably the reason they disconnected it.
The A/C leak is pretty simple. You have to get it leak tested. Most shops charge under $40 for this and can advise you what is needed to repair it. I'm surprised you don't already know with having it charged multiple times. Didn't the shop check it first?