Processor, has no bearing on max resolution, that is dictated by your video card!
But for your question, is there another way to change from right click> properties?
ATI video card, may use "ATI TRAY TOOLS" Where you going to get a little icon near your clock, and you can just chose your resolution from there plus alot of stuff that you shouldn't mess if you don't know
Also MULTI-RES is another tray program that offer, fast access to change resolution.
Now if you can't see anything over 1024, there is only two possibilities
1- Outdated drivers, or not even installed
2- Wrong monitor configuration.. or even monitor do not support higher resolution.
So, if you have the right drivers, your card might not support, if your card support, you monitor doesn't.. if your monitor do, and your card also do.. its a driver problem, get new ones(or rollback one release)
"Chile is a thin and tall country"