Need help fixing this error.. MySQL Error : Unknown column 'mgccustomusergrou

[Lynne]

It's from an add-on you have installed as that is not a default column in vbulletin (at least, not that I recognize - you really should post the exact error when asking for help).
Try disabling your plugins and see if you still have this problem.
Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php

PHP Code:

define('DISABLE_HOOKS', true);