Hi there,
I have a problem with my KDE.. I have two monitors and after instalation i have xinerama-like effect and i cant disable it (I dont have xinerama)
My wallpaper is stretched on two screens, windows maximalize on two screens too.. It is very annoing.. Could you help me?

Which graphics card / driver combination are you using?
If you are using Nvidia or ATI, then you should be able to find appropriate options in their respective settings panels to rearrange the layout of your screens.