atiato
A part of getting confused of the Red hat instalaltion files and what version to use, I suggest you go to the distributors website first. Take redhat for instance www.redhat.com and also www.kde.org ( for the k-desktop environment informations ). If you woudl like to install the OS in your pc, you may try to buy the CD instead, because even if you downloaded it to your PC im sure you may came across some problems such as Partioning and worst file systems.