We all love to shop online these days. Sometimes online deals are too good to be true. How to tell if the computer you just bought has a genuine copy of windows or not:
Almost all computers come with a windows license sticker somewhere on the outside of the case. This sticker contains all the information about the copy of windows; which version of windows and a 20 digit product key. It is possible to not have a sticker but more often than not, if it does not have a sticker it is not valid. Certain computers can save the product key on the BIOS, usually only major retailers like Dell and HP use this, NOT custom builds.\
The most obvious way to tell is there will be a icon on the bottom right logo on the screen asking to activate windows.
The easiest way to to check is performing Windows genuine validation via Settings. Just go to the Start menu, click Settings, then click Update & security. Then, navigate to the Activation section to see if the OS is activated. If yes, and it shows "Windows is activated with a digital license ", your Windows 10 is genuine.