It depends on what part you "took off". If the motor is still attached, and if the motor itself works ( in other words, if the problem is in the switch, not the motor) you can touch wires to a car battery and then directly to the motor leads. If the motor on the window doesn't work, the motor is probably bad. You can order a new one online (usually around 60-70 bucks)
If you still need the window to go up (and the motor is bad) you might want to disconnect that motor and manually feed the line back that holds the window up. That should hold it up. Or just wedge something in there to hold it.
There are a number of ways to get a window to fill the entire desktop space.Windows:The simplest way to do this is to click on the middle button in the top-right corner of a window. This will cause the window to fill the desktop space.You can also do this manually by dragging the edge(s) of a window until it is the size you desire.Mac:One way to do this is to click on the green buttonlocated on the top-left corner of the window.Another way to do this is to to to the very top of the screen, click Window, and then click Zoom on the drop-down menu.As in Windows, a window can be manually resized (in Mac, by dragging the bottom-right corner of a window).
If the drivers side window works; yet, the other three do not check the window lock by the window controls on the drivers door. If it is pressed it will lock the other three windows no matter where you try to roll them down from. If this button has not been pressed I would suspect that the switch is bad or there is a loose connection inside the door panel.