I am currently running Windows 10 on my PC. Windows 7 was the original OS installed and I used the free upgrade to Win10. It's long past the 30 days Microsoft gives you to revert back so that's not an option for me. I really want to go back to Win7 however. How would I do this? Could I download the Win7 ISO files from Microsofts website, burn them onto a disc, and install windows 7 on my PC that way? With a product key of course, I know how to get one. Would I need to uninstall 10 first, or just pop in the win7 disc and have it do the work?