zeromasterz 0 Newbie Poster

Hi i got this gateway 2000 vivitron 12x16 and the controls to change the window size have been snapped off can i change and ajust this monitor using software?
when i boot up the the dos and first windows screen take up the full monitor window space as soon as i get to the log in screen the window is off center and there are gaps on all 4 sides do i need to download some type of software to fix this?
thanks in advance for your replies and any solutions :D