Computer help

Lillianna doesn't know what she clicked on but now my "Start" menu is on the upper left hand of my computer instead of the lower left side and my icons that are usually in the lower right hand side with the clock are now on the lower left side.

I have gone into tool bar and tried different things but nothing will put this back the way it was. When I restarted the computer,it went back to this crazy way.

Does anyone out there know how to fix this? Thanks in advance!