So your saying you have no accounts showing on the main login page at all?
But you had two admin accounts, and both don`t show at login ?
The rule is always one admin account has to reside in windows, so i don`t see how you managed to get into the state you are in.
I don`t even know why you wanted to delete the admin account in the first place.
But it looks like you have messed things up if you do not or no longer have any sort of admin account to login to on the system.