My driver side window wont go up on my mustang. there were no signs of it wearing or slowing or anything. it just wont work now.

Check the fuses. Then check the master control in the driver's door for wear or short.

Make sure all your Fuses are good... The window motors could be going bad. But I'd check the fuses if they just stopped working without any signs of beings slow or being worn out.

If it works with the passenger side switch but not the drivers switch, I would look at the drivers switch for the problem.

Both windows are fused from the same location. Most likely the window motor has gone out or a malfunction this the track mechanism. Check to make sure the window switch in the door handle is good first. Take the switch out, take the wires off the back of switch and jump the wires/connectors together. If window works, replace switch. If all you hear is motor hum or no sound from motor, motor is bad. Window motors usually start to slow down (window rolls up slowly) before they go out.

code drivers door switch faulty .but also check drivers door switch for shortcircuit

sounds like the motor has gone bad..

Try (autozone.com) , sign up for free & get manuals/pictures there.

check the pwer switch. if you don't detect any sign of live. then you have to open the door panel to check the motor. most likely the motor or the "T" rail cable is broken.

inside your motor there are these bushing that wear out you might have to replace them

this may sound stupid but its only a temporary fix. take the panel off the door and tap the window motor with a small hammer. do all the other windows work? does it make any sound when you hit the button? you probably end up having to replace the window motor.