An adjusting system for a motor vehicle door includes a window winder for adjusting a window, at least one guide area of the window winder for guiding the window along a direction of adjustment, a door lock and a lock support. The one guide area of the window winder and the lock support are fixedly connected to one another, such that the guide area and the lock support form a structural unit. The guide area which is combined with the lock support into a structural unit includes at least one overlap area for a lateral window edge of the window to be adjusted and a further guide area of the window winder is provided, which is extended in the direction of adjustment of the window, and is positively engaged with a carrier being forcibly guided along the direction of adjustment of the window to be adjusted.