Windows 10: Change PC Owner/Administrator

Hi Guys -Hoping someone could provide a little guidance/help.I got a new Windows laptop so I am giving my Mom my old one. My email address is currently the primary administrator on this laptop. I want to remove my Windows account completely from the old laptop aka I want all my acount information off the old laptop and set my Mom up as the only user/administrator but I can't seem to figure out how.I added her as a family member with Administrator rights thinking I could then make myself a regular user and remove my ID but that did not work. I am still the primary on the PC

:)

 

Would like to change from owner to administrator

Greetings Ladies and Gentlemen, I would like to change from owner to administrator. Under control panel, user account, user account, manage account, change account, change account type. Under all that is "Choose a new account type for owner ." I am listed
as administrator. But at sign in at start up I listed as owner. As well in Power Shell ISE How I do change that ? Thank you

 

Unknown User as Owner

Hi Bree, thanks for stepping up to address this issue.
As far as I know my External Drive has only been used on my PC.

I could try to implement your suggestion and take Ownership of those Folders.
The "Take Ownership" link is present in my right click menu, but I'm currently logged in with my Microsoft account, so perhaps it would be better if I went Properties --> Security --> Advanced & set the Owner to Administrators, no?!

Although my mind is bugged with a new question now.
If I change the Owner & later on I have to restore a backup (Acronis on a CD) won't I encounter problems then?

 

Change registered owner and administrator

How do I change my registered owner name? And, administrator name?