[RESOLVED] Reloading Windows 10

Since it was downloaded for free what happens if you need to reload windows 10?

Thanks

http://www.howtogeek.com/224342/how-...ll-windows-10/

Quote:

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When you upgrade a Windows 7 or 8.1 system to Windows 10, the installer confirms that you have a “genuine Windows” system installed and activates your computer for use with Windows 10. Note that you don’t actually get a Windows 10 product key — instead, your computer’s hardware is registered with Microsoft’s servers. When you install Windows 10 on that PC again in the future, it will check in with Microsoft’s servers, confirm it’s installed on a registered PC, and automatically activate itself.

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Thanks for the reply! Hopefully I won't need it.