Nissan Repair: 2001 Nissan Sentra, nissan sentra, master switch

Question
My driver-side window will not go up or down, electric, this side only.  Bought this car used, appears someone has at one time or another removed the door panel to no avail.  Have you any suggestions?  Is there a motor that separates the windows?

Answer
Debra,

Either the master switch on the drivers door is defective or the electric motor itself is gone.  My bet is the motor since it will not go up or down.  The brushes wear down and the motor stops working.  I would replace the window motor from what you say.  There is only one in each door.