I have an old Toshiba laptop that I don’t have a Windows operating system installed on. In addition, there is a Windows 7 product key located on the back of the laptop and contains a Certificate of Authenticity (COA).

I will use the Windows 7 product key to activate a Windows 10 computer.

Go to the Windows 10 search bar and type activation.

Select Activation settings.

Search activation and select activation settings in windows 10

In the activation window, click change product key.

windows 10 activation settings window

Enter the product key and click Next.

window to enter product key in Windows 10

Click Activate to continue with the activation process.

Activate window in Windows 10

Now my Windows 7 license key has activated the Windows 10 computer.

Windows 10 activated window

Activate Windows 10 Using Windows 7 key