Can I Reformat windows 10 after upgrading my laptop to windows 10?

My Laptop model  is lenovo G40-70 with a preinstalled OS of windows 8.1. My Laptop comes with a factory reset option. How do I do that in Windows 10 or do I need to clean install? And Where can I download the Windows 10 iso? Lastly  How can It determine if my Windows 10 is genuine after clean installing? I havent yet upgraded to Windows 10 because I'm afraid I might not be able to reformat/reset my laptop to factory settings.

Hello,
I would suggest making a backup of the G40-70, and testing that backup to verify it works.  If there is an option to create factory recovery media for the Windows 8.1 installation the laptop came with, you can try that as well.  Once you have verified you can backup and restore Windows 8.1 on the laptop, go ahead with the Windows 10 upgrade process.
After you have successfully upgraded the existing installation of Windows 8.1 to Windows 10 on the G40-70, you will be able to download the Windows 10 ISO from http://www.microsoft.com/en-us/software-download/windows10 and perform a clean install of it.
Regards,
Aryeh Goretsky
 

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