Cannot access admin area

Hi, i have just installed zen cart on an XP machine running apache 2.2, php 5.4, and have installed the demo database. The install is local on my own pc and i happen to be using 192.168.8.44 as the fixed ip address of my laptop. I can access the demo shop at http://192.168.8.44/catalog/index.php but cannot access the admin area at http://192.168.8.44/catalog/admin/index.php.

I have searched through the forum and faqs to the best of my ability and think i may have an error in the ../admin/includes.configure.php file

// * DIR_FS_* = Filesystem directories (local/physical)
define('DIR_FS_ADMIN', realpath(dirname(FILE) . '/../') . '/');
//the following path is a COMPLETE path to your Zen Cart files. eg: /var/www/vhost/accountname/public_html/store/
define('DIR_FS_CATALOG', 'C:/Program Files/Apache Software Foundation/Apache2.2/htdocs/catalog/');

Please can someone advise.

with thanks in anticipation