(virtual)desktop is too big

i have setup a new pc with winme(20 gb-hdd)

i can reach the folders which are outside the actual screen with the mouse. i relocated them to the actual screen(screen-surface which can be seen).

i do not have this behaviour on my other winme-machines. i do not want the desktop bigger than i can see. its 16 bit, small letters and 728 x1024 -videocard ati rage 128 agp.