Are you sure you didn't log into wm? You can check by right -clicking on sceen, option to logout along with apps menu. If so logout and click on session.
Btw if it's a wm you can add necessary items from MENU UNDER YOUR RIGHT-CLICK.
Everything is there your right -click opens all the doors.
You can also open a terminal and use aptitude or apt-get to get your desktop back.
Last edited by EDDY1; 11-04-2010 at 07:05 PM.