I have a 2000 9.3 with a drivers side window that is stuck. The motor still works but the glass is off track. Is this something that can be fixed without having to take to a shop?

Thanks!
i am replacing the little wheel, but how can i tell when its on the pin itself? because i have felt it "snap" what i think is in place, but it keeps popping out.

Cars & Trucks - Saab - 9 - 2000 Saab 9-3 Viggen