Mar 29, · Microsoft will no longer sell Windows product key, but I noticed that you have the Windows 7 product key, is it a retail key? If yes, if you need to install or reinstall Windows 7 you can use this page to download a disc image (ISO file) to create your own installation media using either a USB flash drive or a DVD. Before you begin. Oct 27, · RELATED: How to Find Your Lost Windows or Office Product Keys. This process is easy. First, you’ll need a Windows 7, 8, or key. If you have one of those lying around, great. If you don’t, you can use a tool like NirSoft’s ProduKey to find the key currently in use on Author: Chris Hoffman. Oct 30, · Microsoft allows anyone to download Windows 10 for free and install it without a product key. It’ll keep working for the foreseeable future, with only a few small cosmetic restrictions. And you can even pay to upgrade to a licensed copy of Windows 10 after you install slicelive.com: Chris Hoffman. Mar 31, · I have the product key that came with the laptop, it just doesn't have windows on it due to an OS change, but I want to re-download windows 7 onto it. Jun 01, · Depending on how you got your copy of Windows 10, you'll need either a character product key or a digital license to activate it. A digital license (called a digital entitlement in Windows 10, Version ) is a method of activation in Windows 10 that doesn't require you to enter a product key.