I recently fell heir to a two year old Sony Vaio running Win 8.1 which had a wrecked screen.
It used to belong to my disabled sister-in-law who has both an electric powered (therefore heavy) wheelchair and a somewhat light hearted attitude towards reversing. She reversed over it. Her insurers accepted this as accidental damage and gave her a new one. I recovered all her data and transferred it to the new computer and then decided that all the computer needed was a new screen. £54 and half an hour's work later it was working fully again and is now mine.
I have full control over it, I know the access password but would like to change the log-in screen to show me rather than her. Is it as simple as creating a new admin account and then deleting hers ? Advice gratefully received.