Ubuntu is not responding after login as admin

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http://askubuntu.com – When I try to start as admin using my password. In next screen only my wallpaper is shown nothing else even no navigation or any button. On the other hand, when I login as a guest it works fine. I am using Ubuntu 11.10 version. Can anybody help me how to resolve this issue. I don't want to re install Ubuntu because it takes several hours to install all the required software again because there is some problem in software manager so I had to install using terminal. For more information of the problem, This problem arises when I tried as guest. After using guest, I tried to use as admin but (HowTos)