Why can't I reinstall Windows onto my PC?

Episode 1420 (1:08:45)

Mike from California

Mike is building a new machine, using a lot of his old PC parts, but upgrading the mother board. Unfortunately, he can't reinstall Windows because the computer can't read the product key. What gives? Leo says it should install, even if it doesn't activate. That will give him 30 days to activate it. He also may want to try Rufus, another free media creation tool that will create a Windows install. Mike likely has a faulty USB key that is causing installation to have issues. It may also be that Mike has made so many changes to his PC build that, to Microsoft, Mike seemingly has a new computer and needs to buy another version of Windows. Leo says to call Microsoft and ask them to transfer the activation to the machine.