I'm getting ready to build a new computer next week and wanted to start completely fresh and not have my new computer burdened by 10+ years of random software. I'm putting a new 990 PRO and wanted to see if I can use Windows from my old computer or would I be required to buy a new license anyways? Would it be easier to just buy a new license as I need both computers operational for at least a few months. Old computer has windows 10 as well.