How to set back the display on my computer?

How can i set and normal my computer display in the wide screen LCD? it look like strichy,?

• i have SIS 661GX Chipset motherboard, i buy a new Samsung 19" wide screen LCD moniter, model no is 920nw, when i saw movies so that is ok and no problem but every thing else look strichy, (icons, pictures, wallpapers) i set up the resulation in 1152 X 864, for this wide screen the resularion should 1440 X 900 (i think as i read in samsung menual) but this resulatoin is not avaliable in display setting, Please tell me what sholud i do? do i need instal a new VGA driver? or should i buy a new VGA or any graphics card that will solve my problem? if there is any driver for my motherboard that solve my problem where can i download? please tell me that link, or if i should buy a new vga card that solve my problem which one should it be, please anwer my question, i will really thankfull to you,

• Answer:

  i dont know what strichy means,sorry.