2. Press the Windows + R to open the Rusluisn dialog, type slui.exe 4, press Enter, and go to step 7 below. 3. Open an elevated command prompt, type slui.exe 4, press Enter, and go to step 7 below. 4. Open the Power Users Tasks menu, click/tap on System, and go to step 5A below. 5. Starting with windows 8 the product key is embeded in the bios. This avoids a major source of porated product keys. When you upgrade ( or restore your current OS) to Windows 8.1 the computer grabs the product key and activates it automatically. Hope this helps and if you need any further assistance post and we will be glad to help you. Or, if the StartFinity button has replaced the built-in Windows Start button, all you need to do is depress the Shift key while clicking on the StartFinity button, and you will instantly get the Windows 11 or Windows 10 Start menu on the screen, without StartFinity getting in the way: You can also use StartFinity Settings screen to reverse this If you're converting a computer from a KMS host, MAK, or retail edition of Windows to a KMS client, install the applicable product key (GVLK) from the list below. To install a client product key, open an administrative command prompt on the client, and run the following command and then press Enter : Update through the store. It's not free if you update using the installation media. The laptop should have a product key sticker on the bottom or under the battery. Most new UEFI motherboards have the product key embedded into it so there would be no sticker. It should pick up the key from the motherboard though. Very first step is to copy all files from Windows DVD. Assuming that you have your DVD at letter W: and that you want staging directory at C:\Windows81, this would be: > ROBOCOPY W:\ C:\Windows81 /MIR. …. Once copy operation has completed, we need to create ei.cfg in C:\Windows81\sources directory. It works when installing Windows 10 with installation media or by entering the key after installing Windows 10. Enter any Windows 7, 8, or 8.1 key that hasn't previously been used to upgrade to 10, and Microsoft's servers will give your PC's hardware a new digital license that will allow you to continue using Windows 10 indefinitely on that PC. If you've lost your Win 7/8 key and you don't have a label or the label is destroyed, you can try using your Internet Explorer key. I've found that the IE key is always the same as your Windows key, but for some reason, upgrading to Windows 10 doesn't change the key over when you pull it with a keyfinder. Edit: for use in the case that you have Z2adYDo.