How can I solve problem in loading my web site?

Hello
I recently bought a domain (sherkadeh.ir) and my host is : (freehostia.com).I installed worpress.
When I type below address,my site appears:
http://sherkadeh.ir/wordpress/
but when I type address without wordpress (I mean http://sherkadeh.ir/) this message appears:

Account unavailable
Maybe account have been moved, deleted, suspended or not activated yet.
The requested resource could not be found but may be available again in the future.

What is the problem?Can you help me?
Thank you

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