drivers or passenger side?
check the switch first...those get gummed up and you can normally take them apart and clean the contacts..
you can also apply 12 volts to the connector going to the motor. see if it moves. switch polarity and it will go the other way. if it does that then the window regulator is good...
if its bad, contact russ he knows a guy who sells them with a warranty. i got one from him.