Hi so I did a clean install of windows 7 from windows 10 because it was giving me "loading operating system boot from CD/DVD" , but now windows 7 is showing up "loading operating system boot from CD/DVD" the same exact error. It's genuine windows key. sometimes it works for a couple hours. What I do when it goes to that screen I turn it off for a couple hours and it works again for some time. Could it be hard drive issues? Or ram?