u hav a graphics card?if u hav try this(mine is nvidia)
right click desktop, go properties,go 2 de tab 'settings',
advance,now there's a window with many tabs.1 of the tabs has your
graphics card name on it (for example(Nvidia geforce
6600...etc)..as mine is nvidia, when i click on the tab a new
window come up.on the left side there are many options. one of dem
is 'screen resolutions and refresh rates.now deres a ' custom
resolution and refresh rates section. Try entring your desired
resolution
This is for me as i have a Nvidia ;graphuics card.If u hav a nvidia
graphics card with latest drivers installed, hopefully this works
for you.