Why am I not Licensed to Use Windows 10 on my Ideacentre?

Episode 1577 (1:06:42)

James from Oakridge, TN
Windows

James was given a Lenovo IdeaCentre without a hard drive. He put a Windows 10 hard drive from an old laptop in his IdeaCentre, but it is now warning him about his lack of registration. Leo says after a period of time, his OS will start doing less and less, so James should buy a license key from the official source.