Tks for your answer m8!
Here is a screenshot that shows what I told before;
solidlocker.webhs.org/fc4/fc4sshot1.png
Today I found a very usefull tutorial, and updated my gfx drivers, rebooted and then I was able to use 1280x800, but I cannot change it, although it's working on 1280x800 the "toolbars" dont seem to work ok, I cannot use the menu.. and they seem to be stucked on 800x600 size, here is a screenshot that shows it;
solidlocker.webhs.org/fc4/fc4sshot2.png
Now I can only access things on console, and really dont know what to do.. gnome-display-properties doesnt allow me to change resolution!
As I said before, Im newbie and now I dont really know what to do.. can anyone give me some tips/help? :P
Thanks in advance