I am upgrading to Windows 10 from Windows 7, at first it went normal, then I left the laptop, let it run for overnight. Next morning I saw the screen showing Installing Windows, your PPC will restart several times. Sit back and relax. A big circle with 15% in the center of the window. I then wait hours and hours, nothing happened. I don't know what I should do from here. I rather prefer go back to my Windows 7.