[ozzy47]

Have you tried on a unmodified default style?
Have you tried with all mods disabled?
What vB version and PHP version are you running?
Are you using any kind of SEO mod?
What is in your .htaccess?

To temporarily disable all mods, edit includes/config.php file and add this line right under <?php add the following.

PHP Code:

 define('DISABLE_HOOKS', true); 


So it looks like this:

PHP Code:

 <?php
define('DISABLE_HOOKS', true);
/*=================================================  =====================*\
|| ##################################################  ################## ||
|| # vBulletin 4.2.2

Use notepad++ to edit any files.