The key for the version of Windows the PC comes with, is stored in the computer’s UEFI firmware or BIOS.

Embedded in your PC’s UEFI firmware: Many newer PCs that come with Windows 8 use a new method.

This system was common for Windows 7 PCs. The one in the registry and key-viewer application is a red herring.

The actual key is on a certificate of authenticity (COA) sticker on your PC or its power supply. 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.

Printed on a sticker: Some PCs use a technology called “System Locked Pre-installation,” or SLP.

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.

Where Is The Windows Product Key Located? Three Places You Might Find the Key: You can legally download Windows 7, 8, and 8.1 installation media directly from Microsoft. Reinstalling Windows often feels necessary, especially on new PCs that come packed with bloat ware.

This is more confusing than it sounds – you may not be able to re-use the key your computer’s manufacturer used. You will need a unique product key to reinstall Windows on your PC.

Microsoft get product key