Windows 10 Product Key Activation Issue

[Heydon2015]

Thanks Compton yes my technician is trying to install windows 8.1 then windows 10 on his support drive and with all the drivers then transfer it as an image onto my existing hard drive as windows won't install on my existing hard drive the conventional way apparently .......so if the worse case scenario happens . Will I be able to install windows 8.1 using recovery media , if that new hard drive is installed onto the same computer with the product key within the bios ? Thanks again