as it a new build go to microsoft web page use the windows media creation tool make with a clean 8g usb stick a bootable windows 10 usb stick. boot from the windows 10 stick..go to advance mode and remove the partion on the drive to make a clean install of windows 10. new version of windows 10 will let you use your windows 7/8 code to register it so you dont have to do the windows 7 to 10 upgrade now.