what you want to do is use a clean drive with no os a ssd or another hard drive. install windows 10 using there free media creation tool. onto a 8g usb stick. want to install clean os onto a blank hard drive wiht the other drives unplugged. once windows is installed and registered power off and plug the drives in. then set them up using windows disk management. once they show up you can move the files then wipe the drives.
if you have a working pc now you can pick up sata to usb hard drive back up cable kit. plug the working drive in by usb cable and then back your files to ext. then you can wipe the drive and reuse it.
myself i would on the new build buy a ssd as the boot drive and then reuse the other drives as storage drives.