What do you have set in your config.php file for the following:
PHP Code:
// ****** PATH TO ADMIN & MODERATOR CONTROL PANELS ******
// This setting allows you to change the name of the folders that the admin and
// moderator control panels reside in. You may wish to do this for security purposes.
// Please note that if you change the name of the directory here, you will still need
// to manually change the name of the directory on the server.
$config['Misc']['admincpdir'] = 'admincp';
$config['Misc']['modcpdir'] = 'modcp';
You didn't say what version you are using and the code I posed is from one of my dev sites using a 3.6.x version.