humvee I appreciate your response.I have checked these forums, by googling the term'404 Category not found joomla 2.5' and applied their suggestions to no avail.I have so far:1. turned off SEF2. reconfigured files such as configuration.php and /includes/application.php files3. ensured to change the default menu4. changed my browser from Firefox to IEThere are some suggestion I could not apply beca