Hi. I am an expert in programming, system administration, OS tune-ups and various other things related to laptops, computers and phones. Being an electrical engineer who knows programming excellently, I can help to the best of my knowledge to speed up the computers. I can't guarantee that the Windows 10 computer would work any better (as you upgraded and might have some weird settings that could only be reversed by a full OS reinstall), but on Windows 7 there are some methods to try. However, based on experience, speed won't get infinitely better, but can improve a bit, depending from PC to PC. If you wish, we can do this with TeamViewer. I can take a look at the Win 10 PC too, but again, no guarantee there (if I can, I tune it up, if not then that's it).