As you havent had any replies I thought I might try;
Looking at the subject, in google, the opinion appears to be that if you
deleted the default Administrator Account, that was set up when Win was
installed, you will have to start again with a complete reinstall.
You are not supposed to be able to delete the default Admin account,
possibly also Guest account, win should give an err.msg preventing this.
You can rename the default Admin account.
BTW what was the purpose in deleting the Admin account, what were you trying
to achieve?
PS I may be corrected by someone more knowledgable on the subject.