error 404

i just installed a fresh version of wordpress. but it is showing 403 error in the title bar and in the body it shows like this-“Forbidden
You don’t have permission to access / on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

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Apache/1.3.33 Server at commenti.org Port 80″
is der anyone who can help me? this installation is in root directry. n i have 3 more sites they too r showing 500 internal server