Move WordPress to main root

I want to move my wordpress to load as soon as you go to my site http://www.ericwagner.co
i use to see it at http://www.ericwagner.co/wordpress/

but it sending me this error: Error occurred: 404 – not found

I’m using MyDomain.com host service and they offer WordPress as web app…so I install it directly in the hosting service.