[ubuntu] Can not log out

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http://ubuntuforums.org – I am using different desktop environment. When I log out from one to log in another, I see the new name so I log into that. But now I can not remember the name. Now I can not log out from the environment. And can not do other things. Mouse works, but with right click nothing appears. Present state of my desktop: http://img194.imageshack.us/img194/3670/img7234b.jpg Only top date bar shows. When I use arrow key in time of restarting those writings show. Main thing is, I try to install tor browser. And after install I can't run it. So I try to change desktop environment. (Hardware)