Your information isn't very clear.
Do you have a 1080P (1920 x 1080) resolution capable monitor? This would mean you have a NEW (last year or two) monitor with a widescreen aspect. (it's rectangular more than it is square).
1280 x 1024 sounds like a traditional (square like) older LCD or CRT monitor. So you'll need to clarify. If your monitor is only 1280 x 1024 you cannot go any higher than that, period.
If you do have a 1080P capable monitor, and the computer only allows you to SET 1280x1024 then you probably need to install the latest graphics drivers for your video card / integrated graphics chip.
Hi jerreece, I have a HP multimedia edition A620N , with XP SP3, it is a 5 years old PC, yes it is a brand new monitor wide screen , I installed the monitor and downloaded the required driver, but my image still seem a little distorted and I cant see the good resolution available in the listing on my PC the maximum capability I can see listed on my PC is for a a 1280X 1024 screen.
thanks for your help