[Plugin: WooCommerce – excelling eCommerce] plugin installation problem

when i install WooCommerce plugin in my site and make it activate then i install the plugin pages give me a server error with any theme

Server error
The website encountered an error while retrieving http://www.myalexmed.com/nour/wp-admin/admin.php?page=woocommerce&install_woocommerce_pages=true. It may be down for maintenance or configured incorrectly.

every time i want to configure it and i am from Egypt help please

http://wordpress.org/extend/plugins/woocommerce/