Actually Reverend in you vbulletin go to this link...
admin/setting.php
You'll find the registration options and where it says add just add one to the registration settings set...
As follows:
Name: Quick Registration Enabled?
Variable Name: QRenabled
Value: 1
Description: 'Allows unregistered users to use the Quick Register Option (Notice: This option doesn't use the coppa function!
Type: yesno
Order: 18
Then you don't have to run the query
g-force2k2