@Finn Jacobsen
Hi,
All user accounts are stored under c:\users(account name)
- Open Computer Management, select Local Users and Groups, Users. Then in the right panel, find your old logins, and delete it. This will delete the user login.
- Open File Explorer, RMB This PC, Properties, Advanced System Settings, Advanced (tab), Settings (under User Profiles), highlight an account that says LOCALPCNAME\Unknown, press the Delete button below.
You should have a backup of your data in either case.
Hope above information can help you.
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.