common problem for all cars not just a chevy. what happens is you don't use that window very offten and then the motor will stick inside and not work. you can hit them and get the to work again, its best to open and close all the windows a few times a week just to keep them all working.
also there is no fuses, there is a circuit braker though. can't remember if there is two for 4 windows or 1 for 4 windows.