Microsoft Windows 10 Professional Oem Product Key X86/x64 Bit
Windows 10 Pro Oem Activation Key

Microsoft Windows 10 Professional Oem Product Key X86/x64 Bit

A simple question for those of you who might have tried this (I personally always installed Win 10 from a fresh format). I built a system for a customer/friend of mine, and originally intended to use Windows 7 on it. I instead installed Windows 10 WITHOUT a product key for the sake of testing. I liked it, and decided I would stick with Windows 10 for this build. Now however, I have to use my OEM key on it, since I obviously won't be selling this machine without an activated Windows.
Does it really need a fresh install, or could I simply go to Account, Activate Windows and feed it the OEM key there, just like if I had bought a key from the Microsoft Store ? I so don't feel like formating again and reinstalling all that software if it can be avoided.
Thanks in advance guys

Windows 10 Pro Oem Activation Key

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I bought Windows 10 Professional & completed a fresh-install (complete reinstallation) of Windows, only that it installed Windows 10 Home instead of Professional. I'm guessing this is due to the Windows 8 Standard Edition serial key preinstalled in the BIOS.

Microsoft allows anyone to download Windows 10 for free and install it without a product key. It’ll keep working for the foreseeable future, with only a few small cosmetic restrictions. So the Windows Store will only let us purchase the $200 Windows 10 Pro license. Microsoft just didn’t officially allow you to download Windows.

Windows 10 Pro Oem Serial Key