My computer was working great with Win 7 Pro. I was bombarded with Win 10 upgrades. At some point, I slipped up and allowed the upgrade. I didn't like it and was intending to go back. It was unable to change settings on the incessant updates and one came along. After the upgrade, the computer would not boot. I tried everything I knew and could find, but no luck. Then, I have no idea how or why, I found a link called Windows repair. What a nightmare. In the end Win, 10 dominated and would not allow any return to the original. There is a constant problem with changing settings, unauthorize by me.
Presently, I am planning to reformat and clean install Win 7 Pro or Ultimate. I have about 8+ windows install disk, and while in the hospital, my wife decided to help me out with a good clean up. OH boy! Neatly stacked on a shelf are all the disks. Nearby neatly stacked is a pile of 'keys'. No indication of what belongs to what. Is there any way to determine which key goes to which disk? I really hate to give Microsoft any more of my money!!