Documents tab in finder opens 'terminal' rather than my document folders

Hi,

I was hoping to get some help!

When I open my finder and select the Documents tab, instead of showing all my folders it opens something called 'terminal'.

Also when I select the Desktop tab it opens iPhoto.

I've tried right clicking on the tabs and selecting 'get info' and changing the 'open with' but I can't seem to select how it was originally.

A few weeks ago I was using an external hard drive to back everything up, since then I've had this problem.

Hope you can help!

Thanks!