return to login menu after login

Hi, all…

I’m new to openSUSE. This morning I just update my openSUSE 11 to latest kernel. After restart I lost my GUI.
Than I run yast and change the ‘Graphic Card and Monitor’ from hardware setting menu.
Now I got my log in window; when I tried to log in I could see the loading progress bar, but after that I got log in window again.
Do I need to reset KDE setting or KDE session?? how to do that?? or just remove the .kde4 directory?

Any one please help me with this problem…

thanks in advance