I have exactly the same problem-- created a dummy account I never imagined using with dummy information, no admin (or any other) accounts on the login page in safe mode. When I try to use the account reset online, I am informed that I didn't provide sufficient information (as I have never had another password, created folders, or sent emails from this account, there is no more information).
Have you been able to resolve this issue? Phone support has told me they are completely helpless to help me, and the account reset page is also not helpful.