How to allow anonymous user register Civicrm event without create drupal account I'm using D7 CiviCRM 4.4.6.

I had a civicrm event with profile fields for user to fill in.

Anonymous users are allowed to register the event and create civicrm profile.

But there is a "Username" field, which force anonymous user to create a drupal user account when registering the event.

Is there anyway which anonymous user can register in my event, creating profile, without create a drupal user account?
Edit the profile that you are using for the event registration and under advanced settings (at the bottom)

select "No account create option" radio and "save"

Good luck!