Experaince and Consintartion window
 

For some reason or some how i have deleted the window that shows my experience, name, concentration slots. Any one have an idea of how to get it back or find out where it might have gone. I have hit f10 and cant seem to find it.

You hit Alt X and it will hide this window.

Yes Alt+X shows / hides the experience bar.
For the concentration window that is part of the player window and its visibility is controlled with Alt+U.

Hope that helps,
Draven