Your Windows 10 product key serves as proof that you actually own Windows 10, and might need to be entered when you reinstall or upgrade Windows.

You might know your version of Windows (i.e., Windows Home or Windows Pro), and hopefully you knew how to get Windows for cheap or even free, but do you know if it ...

When Microsoft first launched the Windows operating system, installing it was only a matter of copying the program onto a disk. You didn't have to verify your copy of Windows. Starting with Windows XP ...