Thanx for the reply!
The problem is not that I can't add stuff to my panels. The problem is:
1.The "Main Gnome Menu" (The yellow star, usually placed in the far left end of the Panel) contains none of the usual choices like "Office -->", "Multimedia -->", "Configuration -->", etc. All that is left in the Menu, are items like "Log Out", "Search for Files", "Recent Documents", "Run Applications". If I choose "Run Application...", all I get is an empty window of "Known Applications".
2. When I try to add something to the Panel, I get a lot of applets and stuff to choose from, but no Applications.