You don't have permission, after rename guestbook

Hi
I use guestbook 2.3.3
I renamed the guestbook but it didnt work, so I renamed it to the original name but this is the massage I get when trying to access the guestbook or the adminstration:

You don't have permission to access /foro/admin.php 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/1.3.36 Server at www.mariadelmonte.net Port 80

or

You don't have permission to access /foro/index.php 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/1.3.36 Server at www.mariadelmonte.net Port 80

so, how can I fix it.
I would appreciate any help...

Check in the foro folder for a .htaccess file and delete it.

I deleted the .htaccess , but doesnt work...