there must be some chap on this forum who knows what to do with the settings on my computer

i've got a new computer with vista

the display settings only go up as far as 1280 x 800 and yet the moniter i've got is a 22" and needs to be run at 1680 x 1050

the question therefore is, how the fuck do i change the settings

i've been buggering about for the past hour trying to sort it but nothing i do lets me adjust the settings any further