Trying to install Concrete 5

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I'm trying to install concrete 5 - I think I'm almost there. I have the database setup and whatnot.

I get to the page with the testing and all are green check boxes. I click Continue to Install, and fill out all of the information requested, including the database info, click Install and then goes to a page that says:


Not Found

The requested URL /tioga-apartments/tioga-apartments/staging/index.php/install/-/configure/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache Server athttp://www.tioga-apartments.com Port 80


Here is what I don't understand - why would it repeat the domain name - /tioga-apartments/tioga-apartments/?????

I'm installing Concrete 5 into a directory called /staging so it should only bewww.www.tioga-apartments.com/staging....

Any help would be AMAZING! I'm not new to web stuff but for content management - I have only experience with WordPress.

Thanks in advance for any help!