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. The 8.1 update from the store didn't give you a key, it's really just a service pack for Windows 8. The only supported method in your circumstance is to install 8 clean (you can do that using your Windows 8 Pro CD), then update to 8.1 from the store. To do a clean install using your upgrade cd, use these steps: If you lose the key, you have the following ways to find your Windows 11/10 Product Key: Using a VB Script. Via Command Prompt or PowerShell. Using a free Windows Key Finder software. If you do A generic key, also known as a default key or a public key, is a type of product key that can be used to activate a Windows 8.1 installation without the need for a specific product key. This makes it easy for users to install the operating system on multiple devices without having to purchase individual keys for each device. When installing Confirm that you want to allow the app to make changes if necessary. Step 2: Enter the right command to view your product code. Enter this exact, case-sensitive code to proceed — copying and Fixed a bug with the 'N' character location on the product key of Windows 8. Version 1.55 Fixed ProduKey to decode properly the product key of Windows 8. Version 1.54 Fixed issue: The properties and 'Select Source' windows opened in the wrong monitor, on multi-monitors system. Version 1.53 Now, I only have Linux on the machine, but I'm trying to recover the Windows 10 Product key which came with the computer so I can add a Windows partition back onto it and activate it. I read here that you can recover the product key from within a Windows Command Prompt: To locate the product key in the registry, these the steps you should follow. Right-click on the Start menu. Select the “ Search ” option. Search for “ Registry Editor ” and open it. In the registry, copy and paste the below path in the address bar and press “ Enter “. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion. My computer came from HP with Windows 8. Microsoft updated it to Windows 10. A Windows 10 update failed and locked up my computer. I had to reset the computer to factory. To activate the factory Windows 8, I have to re-register Windows. I am asked for a product key. Since you upgraded from Windows 8.1 to Windows 10 using the free upgrade, you should have a digital license instead of a product key. Digital license is an activation method in Windows 10 that doesn't require a product key. We suggest using the Activation troubleshooter and try activating Windows 10 again. 7fs9.