My ubuntu 11.04 was corrupted when run my python code?

I have developed the code by using python 2.6for display all the videos in libavg. It was successfully run by ubuntu10.04.But now i just try to run my code to ubuntu 11.04, in that i found that the Ubuntu 11.04 has python 2.7. so i download the libavg and install all the supported libraries in ubuntu 11.04 for libavg 1.6. Then i open usr/local/lib/python 2.7/dist-packages/ in that i found that libavg was successfully installed. Then i was installed the site_ruby. Then i was paste my python code into opt/video. Then i was run my code. Then It throws error as ERROR: ld.so: object '/usr/lib/libstdc++.so.6' from LD_PRELOAD cannot be preloaded: ignored.
But i was installed that libstdc++ package. So that i gave this command and check which is in present or not: ls /usr/lib | grep libstdc++.so.6. It is available. So i decided finally perhaps this may clear after restart the system . So that i was restarted my system. Then my system had been boot successfully then i was login. Finally, in Desktop, all my folders are visible.but there is no visible even a single menu. i cant able to open a terminal through short cut key also. Ideally, system shows only desktop.

Is there any possibilities to rectify this problem? why the system was corrupted?