Desktop broken: no launcher and no windows

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http://askubuntu.com – Today my laptop (Lenovo thinkpad t530) stopped booting at 'checking battery state' or a similar message. Loging-in to the regular console (alt-ctrl-f1) was possible, and I figured maybe it is some messed up driver thing. So I reinstalled the nvidia-current drivers (apt-get install -reinstall). This fixed the problem, however now after login in I see my desktop, but no launcher! Furthermore if I start an application (ctrl-alt-t does work) I cannot move the application around (i.e. there is no real window, just the application itself) nor can I use atl-tab to switch applications. Basicly I cann (HowTos)