You can't repair it - you have to replace it.
Remove the inside door panel. The entire power window mechanism will be visible. Put the window back onto the window track.
go to flickr, I have several pictures on how to fix.
Here's how to test and repair power windowshttp://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-regulator
See this post for instructions and photoshttp://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-regulator
You must replace the entire regulator.Here's howhttp://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-regulator
You have to disconnect the glass from the regulator or clip the regulator cables.See this post for instructionshttp://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-regulator
Can't be done. You must replace the entire window regulator.Here's howhttp://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-regulator
First test to see if the problem is the switch, wiring, or the motor. Here's howhttp://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/test-power-window-motor-and-regulatorThen replace the regulator if the switch and wiring test good. Here's howhttp://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-motor-regulator
Broken window glass sash clips or door glass attaching clips.Here's how to fix:http://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-regulator
Here are complete step-by-step instructions (with photos) on how to remove a door panel: http://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/remove-a-door-panel-from-any-vehicle-without-a-diagram Here are complete step-by-step instructions (with photos) on how to test a power window motor to determine whether the problem is in the motor/regulator or the switch/wiring http://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-regulator -cable
If your talking the spring on a power window it helps raise the window when you activate the power window so it takes some stress off the motor.
If the regulator is broken, you'll have to clip the cables to get to the window glass attaching bolts.Here's how to do ithttp://www.ricksfreeautorepairadvice.com/repair-topics/window-power-repair/replace-a-power-window-regulator