It appears to me that the old user account was the built in "Administrator" account and was renamed. So it should NOT be deleted, but renamed to Administrator, IF it is truly that.
On ANY used machine one should do a CLEAN reinstall of the OS. This will clean you your current problem and possibly many others that you have not seen yet.
What is the make and model of this machine so we may be more of help?
On ANY used machine one should do a CLEAN reinstall of the OS. This will clean you your current problem and possibly many others that you have not seen yet.
What is the make and model of this machine so we may be more of help?