How can I recover Windows 7 from Windows 10 when I can't open the settings screen on my PC?

[WPCentral Question]

I installed Windows 10 about a week ago but don't like it and want to reinstall Win 7 on my AMD quad core PC. However, I can't open the Settings screen. Every time I try I just get a flash of a white screen and that's it. How can I overcome this problem?