Find Product Key in Windows 10 | Tutorials - Ten Forums How to View the Product Key in Windows 10 The Windows 10 product key is a sequence of 25 letters and numbers divided into 5 groups of 5 characters each (ex: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX) that is used to activate the 32-bit or 64-bit Windows 10 edition that you have installed OEM PCs store and encrypt the product key in the UEFI firmware chip The product key is no longer on a COA sticker to