XAMPP and Joomla15

[gui]

We're trying to install joomla in our Mac OS X, but it keeps me give a error message when I click the link below:

http://localhost/joomla15/administrator

and the error is:

Object not found!

The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again.

If you think this is a server error, please contact the webmaster.
Error 404
localhost
Fri Feb 12 11:16:19 2010
Apache/2.2.12 (Unix) DAV/2 mod_ssl/2.2.12 OpenSSL/0.9.8k PHP/5.3.0 mod_perl/2.0.4 Perl/v5.10.0

What should we do?

[Smackie]

well first of you might wanna try http://localhost/joomla15/administrator.php