The driver's power window doesn't want to go down. If you knock on the panel it'll go down a little bit. It goes up just fine. Is this a problem with the motor or regulator or what? All the other windows are working fine.
More than likely its the switch itself, but it could also be something hanging up on window tracks or regulator, does it bind up or is there any abnormal noises when it does go up? If not then its probably the switch, if you know how to use a trst light or multimeter you could check to see if you get switching 12volts at motor