i have had dat problem aswell it could be various things like the central locking pump coz the locking is done on a vacume system, it could be your drivers side door latch coz it all stems from there and they aint cheap, or a wireing problem i searched high and low to sort this out round the car and in the end for me it was my remote central locking system wasnt set up correctly to sync with the windows coz golfs have a thing if you unlock the car and hold the key the windows all go down and if the lock the car and hold the key they all go up, good but bloody annoying lol well hope dis helps