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Your Windows 10 license is reddit windows keys also locked to a particular computer’s hardware. If you make a big hardware change, or change computers entirely, then you’ll have to do a reactivation so bind your license to the new hardware configuration. If Microsoft thinks you are abusing your license by installing Windows 10 to multiple machines at the same time, they may be unwilling to do this.When you switch from a “local account” to logging in with your Microsoft Account, this probably happened automatically. If you are trying to activate a copy of Windows, simply change your account from local to Microsoft and it should work.The same applies if you upgraded a copy of Windows 7 or 8, for which you would have needed a Microsoft Account. Simply log into Windows with your account credentials, since there is no product key involved here either.One of the easiest ways to retrieve your product key from a running machine is to use a third-party utility. Produkey worked perfectly for us on the latest version of Windows 10. Just run the program and your product key is right there.If you bought a pre-built computer or laptop which came with Windows 10, check the chassis for a sticker which displays the Windows 10 product key. This is becoming less common with high-end laptops such as unibody ultrabooks, but plenty of computers still display their product keys on a sticker.