Xubuntu desktop missing taskbar and menu bar

[godrox]

I have Xubuntu Edgy on an old Toshiba notebook and it was working fine for a while, but recently the desktop lost it's whole interface no apparent reason. It boots up just fine, the login screen appears, I login successfully but all it shows after that is my desktop background image and the files and folders I had sitting on my desktop. There's not taskbar at the bottom of the screen nor is there a menu bar at the top.

Here's what I've tried so far:
1. Rebooting lots of times hoping it'll come back.
2. Hitting ALT+F2 to bring up "Run program" and using that to run terminal commands, such as "sudo apt-get update" and "sudo apt-get install xubuntu-desktop" but that didn't do anything.
3. Using "Run program" box to open the Update Manager and installing all new updates.

I'd like to upgrade it to Feisty, but I'm thinking that maybe it should be in a functional state first.

Any ideas how to bring back the rest of Xubuntu's GUI?