you could do some tests to see if its the regulator or the motor or relay or the switch ,if it sounds like the motor is working then your reg is probly stuffed but if no noise then pull your door trim off and
try direct power to the motor of the window (use a battery and 2 wires ) swap them from pos to neg for up and down etc ,if window goes up and down then your window reg motor is ok , if not then start with a new motor ....
if motor is ok id then move to the relay box they always stuff up ,i got a blown one the r/h/r door on my cefiro i found t hat was bugged cos i swapped it for the other side one and it worked but if you have r33 2 door you will need to get one off an other car cos it runs the other door too, if thats ok then try an other switch . Other wise an auto electrition could find the prob but will prob cos $75+ just to find the problem .