Via/S3G UniChrome Pro IGP in 1280x1024 ???

[sales11]

Hi, i'm not good speking english... but i have a problem with my PC and I need some professional help... ok here's the problem:
(I've got a P4M800 Pro and a VIA S3G Unichrome Pro IGP)... I need to have a resolution of 1280x1024px at 32bit but my controller S3Tray Plus don't have that mode... i really need to have it because my LCD is suffering with a 1024x768 resolution... please help me! Thanks!
P/d: That 1280x1024 resolution had before... but i lost it with a PC formatting... and i can't recover it... :S so what i have to do??? i have the latest drivers for the VIA chipsets :S !!!HELP!!!