The Windows license is stored in the UEFI Bios and you can activat your installation afterwards again.
First I did a backup of all me installed drivers with the freeware tool “Double Driver”.
Prepare a USB Boot stick with the windows 10 install image
Boot from USB stick and start the windows setup
During the setup delete all partitions and windows should use the hole free space.
After successful installation re-install the drivers from the “Double Driver” backup
Activate Windows again if necessary.
Done 🙂
