I spent an hour trying to delete the administrator account as part of the installation process and kept getting "application error 0001200" screens where array_merge() was failing in the error_api file. I tried un-protecting the account and that did not help. (note, that I was trying to delete it both under a different name, and as the administrator. Neither worked. I tried multiple times.

Finally, I decided to try giving the administrator a valid email address (instead of the default of 'admin') and to give it a real name of 'admin'. Bingo. I was then allowed to unprotect it and then delete it.