System Panel disappear.

Dear all, I lost my CentOS 6.4, Systems default bar/panel where we navigate our system for the Applications, Places & System, Is there anyone who can help me please???

Press Alt + F2
At the Run Application box enter gnome-terminal

cd ~/.gconf/apps/panel
rm -rf general
killall gnome-session

That will kick you out of gnome.
Login again and the default panel will be restored.