I saw this same problem in another post but it was not answered. I am hosted on Cirtex hosting. I get all the way to where it needs to install the database table and get an error:

Forbidden

You don't have permission to access /install/install_create_tables.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

My permissions were set to 777 on the install directory and I got the problem. I tried changing them to 755 and still got the same error. I have version 2.8.2 of vshare and my php is 5.2.14 and MySQL is 5.0.92.

Could use some help here.