I had been running Windows 7 on my computer for several months when I decided to do the Windows 10 Upgrade which took a couple hours. The results were a faster pc but there were also a few glitches with some programs that were previously installed and wouldn't you know two of those programs I needed to do a project. I went back to Windows 7 so I could finish those projects and in the mean time after doing some research I discovered Windows 10 Upgrade works better on a clean install of Windows 7, 8 or 8.1. So, I cleaned the hard drive, installed Windows 7 and did the updates then upgraded to Windows 10......been running fine these past several months.