Bongo Fury

Drivers side window stuck down,any idea what it can be,thanks.

Most likely switch or wire break in harness. Has been intermittent before going completely?

have managed to get window back up,but now driver and passenger windows wont go down.

As Mike says, most likely a break where the loom passes from the pillar into the drive's door.

Strip off the outer insulation and you may well spot the damaged wire/s.

Simple diy or new looms can be bought, but not cheap.

On mine it was the thick black wire, in the loom between door and frame, that had broken.

If the window try to move when you press switch or just make a clunk. Might jut be the the window rubbers that the windows slide down through need lubricating. Ours has times when they get stuck. I used some scilicon spray last time, not sure what others use.