If your PC uses this, the product key on your PC-the one stored in the registry, and the one key-viewer applications display-will be different from the actual key your PC needs.
Crucially, you'll need to grab it from your operating system before you begin reinstalling Windows or it could be deleted if you format your hard drive. You can extract this product key, and-often-enter it when reinstalling Windows on your PC. Stored in software on your PC: When you (or your PC manufacturer) installs Windows, Windows stores its product key in the registry.
The key you need will be in one of three places: Related: Where to Download Windows 10, 8.1, and 7 ISOs Legally
