Missing Menu / Start Button

[iamcartoon]

For some reason my start button and cluster has gone missing.

If anyone could tell me how I can get it back it would be much apppreciated. I can't find a way to do it at the moment and have had a look around on the forums.

I thought it might be in the UI menu somewhere, but hitting escape does nothing so I can't get into the menu.

Many thanks in advance.