Why won't my window go up after I slammed the door and it fell down?

It has most probably come off the bracket and or the window winder rail you will have to remove the door panel so you will have access to the rail system and put the window back in the correct place on the railing or it could be (less likely) that the railing bracket has broken somewhere and if so the railing system will need to be replaced or fixed if possible. Please post an update as to whether your problem was resolved