Trying to Create New user with Create User Wizard and getting name already exists! ??

hi,
I am using a create User Wizard for registering a user and have converted it to a  a template to capture additional
information.  In the CreatedUserEvent handler in Code Behind I  am getting the UserName of the new user and
their unique GUID key. This is then added to a seperate data table with addditional info captured from the user.
The textboxes within the create user Wizard have validation controls. If the user has missed an entry these fire
and it shops the process of creating the user. BUT  If I then complete the textboxes and then click
submit it says the USER NAME already Exists! This is not what I want as the User just needs to correct
the errors in the form and they should be able to keep their iniital User Name choice.
Do I need to change the Event handler and if so am I still able to c ...