Terrible to hear this. Will it go right down, and if so, then it should align in the window channel as it's going down, then it should return to normal position when you put it back up. Do it with the door open so you can help it guide down.
The question is do you intend to modify the body at some point, as the Nissan is a very modifiable beast and the body modifications available outweigh the competition. Lots of power available too.