Windows 10 is malware, pure and simple. I have just spent the last 3 days resurrecting my dad's computer after it "upgraded" itself, and became unbootable. Not only that, but it broke pretty much every driver on the machine to the point where Win7 became a total PITA to reinstall(broken video driver, broken chipset driver, broken USB driver, etc.). Fortunately, I found a fix, and it is now smoothly running Win 7 Ultimate. Now I get to reinstall all his software and return his machine to service.