I received a brand new "bare bones" computer from my brother for Christmas, has no OS. I have a laptop & a desktop which both have win8.1. I'm too broke to buy a new OS but I have 2 or 3 copies of XP, 1 Vista plus, a win7 that I've already upgraded and cant use. I would like to (if I can) transfer the OS from my desktop to my new computer and then install one of the old OS back on the older desktop. Would I just zero fill the disk on the older desktop, install win7 on the new one and upgrade it, then install one of the older OS back on the old desktop. I cant afford to purchase a new OS, and not using any of the old software. I'm almost willing to give that a try unless someone has a better idea.