If it keeps nagging you to activate, you need a product key. You must purchase one online somewhere and use that to activate windows.'
If you already used your product key and you're saying its having issues activating, try updating Windows 10 to the latest updates. Sometimes that solves problems connecting to the windows activation servers
it should activate itself, otherwise you can right click This PC on desktop and select properties, and in the bottom area of next pop up, it should have a button saying register now, or something like that.
Either with a valid Windows 10 license that you purchased from Microsoft or a valid retailer
Or from a previous valid, qualifying, Win 7/8/8.1 license.
If it keeps nagging you to activate, you need a product key. You must purchase one online somewhere and use that to activate windows.'
If you already used your product key and you're saying its having issues activating, try updating Windows 10 to the latest updates. Sometimes that solves problems connecting to the windows activation servers