If you need to install or reinstall Windows 8.1, you can use the tools on this page to create your own installation media using either a USB flash drive or a DVD. Windows 8.1 editions below are valid for both Windows 8.1 and Windows 8.1 Professional. Select an edition from the drop down menu There are a few ways you can still get Windows 10 for free, without using a pirated license: you can install Windows 10 with a 7 or 8 key, or install Windows without a key---it will work just fine, save for a small watermark reminding you to purchase a license. Here's how each of those methods work. Provide a Windows 7, 8, or 8.1 Key Click on the ACPI Table button at the top. After that click on the MSDM tab. Your BIOS's product key is at the bottom. When the program opens just remember to close the bottom windows first - having two windows open can cause the program to crash. If you buy Windows 11 license keys, you will be able to use them for upgrades (Windows 10 -> Windows 11) or clean installations of Windows 11. I would encourage you to check your organization's license agreement. ----- If the reply was helpful please don't forget to upvote and/or accept as answer, thank you! Best regards, Leon Windows 10 still activates with old Windows 7 and 8 product keys, if you have no activation and do have a old PC around, try the product key I have a Windows 10 PC that suddenly stopped working. Recovery is not working. Rollback is working forever without any progress. Reset PC from the recovery menu does not work. So I guess I have to reinstall windows with the media creation tool. But I don't know my windows product key. Will I need to enter it when I reinstall Windows on the same Press Windows key + X then click Run, then type: slui.exe 4. 2. Next press the 'ENTER' key. 3. Select your 'Country' from the list. 4. Choose the 'Phone Activation' option. 5. Stay on the phone (do not select/press any options) and wait for a person to help you with activation. Windows 7: Click the Start button, right-click Computer, and click Properties. Then look under Windows activation. Windows 8.1: Go to Control Panel, click System and Security, and click System: Then look under Windows activation. Windows 10: Open the Settings app, click on Update & security, and navigate to Activation. ulJELZ.