If you can hear the motor turning when you push the window roll up button, then it might have just popped off the tracks.
It'll only take a few minutes to pull the carpet panel off, then the metal panel underneath. Then you can see if the wheels are off the tracks, and if so, it's not too hard to get them back on there. Pull the window up with your hands a few inches, then use your key to move the wheels up near the tracks, and pop them back in.
Mine used to come off about once a week. It got so I left those panels off all the time.
If this is what's going on, it's better to drive with it all the way up or all the way down, not anywhere in between.