I need to find out what my real options are, and how to do them: I just built a new computer. I haven't installed an OS yet. I have a physical, unopened/unused copy of Windows 8 pro. I also have an 'upgrade' disk to windows 7 home from a long ago computer that never used it. What are my OS options in this situation?: Can I 1. Get windows 7 running by some upgrade/downgrade process? My first choice would be to have Win 7 running. I know it, and I like it. 2. Can I get Windows 10 running with the disks I have. Most importantly, whatever I can do, where can I find reliable instructions on how to do it? Microsoft is a nightmare. User threads are dated. So, my preference is runnning Win7. But if not, I'd like to run Win 10 before the July 29th offer expires. What can I do, and as importantly, *how* can I do it by a process known to work? Thanks in advance