Originally Posted by mikeso
I would like though to install a second OS which is free-ware and unlike Kubuntu but as powerful and userfriendly.
With no clue of your goals, how can anyone give constructive advise?
Opinions obviously vary on what "userfriendly" means. I found Kubuntu 10 very unfriendly. Maybe 11 is a lot better. But more likely, you just have a different concept of userfriendly than I have.
Do you want to try Gnome instead of KDE?
How "unlike" Kubuntu do you want?