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My Microsoft Account keeps showing an old name which it shows as invalid.

Old User Account Still Showing Up

My wife got a new laptop and I’m using her old one at work. While still on Windows 7, I deleted her account and set up a new one in my name as administrator. I then upgraded to Windows 10. Every time I restart the laptop, Windows 10 wants to default to
her old account and shows it on the login screen. My account is listed in the lower left corner of the login screen as an additional account. I have to select my account instead of hers, enter my password and login as usual. Her name/old account is NOT
listed under user accounts or family accounts, etc. I have not found any way to completely delete her account or any other evidence of her name on this laptop.

How can I get, what seems to be a ghost account off this laptop? Thanks in advance for any suggestions!