As with any clean install, you will need to back up all of your personal data, passwords and the like before proceeding as this will be wiped otherwise. When you’ve done that, follow these steps.

1. Get a Windows 10 ISO image from here.
2. Burn the ISO, or mount or extract it.
3. Open File Explorer and navigate to either \Windows\x64\sources or \Windows\x32\sources. Find gatherosstate.exe in the folder and drag it to the desktop.
4. Run the exe. This will create a GenuineTicket.xml file. Save this to a USB flash drive or anywhere else other than your system drive.
5. You can now format your drive and run the clean install. Skip the product key.
6. Once Windows 10 is up and running, copy GenuineTicket.xml to C:\ProgramData\Microsoft\Windows\ClipSVC\GenuineTicket.
7. The folder is hidden by default. If you can’t see it, go to File > Options > View > Show hidden files, folders and drives in File Explorer.
8. Reboot your PC.
9. Hit Windows+Pause. This will bring up a window showing system information, and at the bottom it should show Windows 10 as activated.

from:
http://betanews.com/2015/08/31/how-to-do-a-clean-install-of-windows-10-the-easy-way-no-upgrade-required/

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