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It will reactivate automatically on reinstall without entering a key (if you are reinstalling on the same machine you activated Windows on). If you upgraded to Windows 10 for free the license is tied to the computer hardware or your Microsoft account.It will be read automatically on reinstall if your computer is from a manufacturer such as Dell or HP etc. Windows 8.1 or 10 users will either have a separate key if Windows was purchased as a standalone product or the key will be embedded in the system BIOS. Windows 7 users will have a product key sticker. You need a legal Windows license or the new install will be in trial mode.For example, you can replace Windows 10 Home 32-bit with Windows 10 Home 64-bit.
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