Do I Need to Deactivate Windows 10 Before Reinstalling?
Contents to Move a Full Windows 10 License, or the Free Upgrade from a Retail Version of Windows 7 or 8.1, the License Can No Longer Be in Active Use on a Pc...
To move a full Windows 10 license, or the free upgrade from a retail version of Windows 7 or 8.1, the license can no longer be in active use on a PC. Windows 10 does not have a deactivation option.
Does reinstalling Windows deactivate?
Yes, as long as you do not replace the motherboard (if it is OEM) then you will be able to reinstall without having to purchase again.
Do I need to deactivate Windows?
If you are about to sell or give away your PC but want to keep Windows 10 installed there, it is a good idea to deactivate it. Deactivation is also useful if you want to use your product key on some other PC and stop using it on the current PC.