Windows 10: didn't remove windows key from my old pc which I sold. recently

today I should my old pc except my storage drive. but unfortunately I didn't remove my acrivation key. how to transfer my key to new computer?

:)

 

Recent File List

Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file1

Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file2
Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file3
Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file4
Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file5
Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file6
Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file7
Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file8
Remove-ItemProperty -Path "Registry::HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion
\Applets\Paint\Recent File List" -name file9
...

you get the idea. ( too lazy to put it in a for loop and test it.

or just open regedit and remove all the fileX from that key.

 

I sold my old PC, but forgot to remove it from my MS account

A few weeks ago, I sold my old Windows 10 PC to a friend.

The PC and (presumably) its activation key are both registered to my MS account.

Before selling the PC, I reset it with the option to "Keep nothing", but now I realize I forgot to remove it from my devices.

I would like to remove the PC from my account, but I'm afraid this could cause issues for my friend. I feel responsible, since I sold it to him.

Will he be unable to use the PC if I remove it? Will he have to re-activate it? Is there anything I should tell him when I remove the device from my account?

Both my old and my new PC are using different license keys, and since I paste my activation keys on the front of the PCs I use them on, he should have no difficulties re-activating. I just want to know what possible problems could arise from de-authorizing
a currently active PC in use by someone else, and if he'd need to take some steps beforehand.

We live quite far apart, so visiting him is not much of an option. He already emailed me that the PC is working fine, and I'd like to keep it that way.

 

Unlink an old android phone from my pc

I go thru the suggested steps: Start - Settings - Phone - Unlink this PC.

When I first open the "your phone" screen the old phone is listed. Not sure if the phone listed is suppose to be selectable or not, but my is not. When I select "Unlink this PC" the phone listed is removed. When I select "Add Phone" the old phone still
shows. I have removed the old phone from my Microsoft Account. I have rebooted after unlink this pc but I still cannot remove my old phone.