Desktop moved to left

I was doing something cant remember what now and I noticed the icons on my desktop move to the left I fixed this by dragging the icons over to the right. When I clicked on the start menu I noticed that all icons were almost out of view on the left outlook express internet explorer etc. Anyone know how I can get these to move to the right?

 

Sounds as though your display is going off one side of the screen. Adjust your monitor settings to fix this.

 

I never thought of that I was thinking it was a computer problem. Thanks Jamie I have now adjusted the settings and this post is solved.