The windows is legitimy. It come with my laptoop. I have almost buy KTS. But I decided to try it during 30 days before buy it. And immediatlly I’ve face problems. This is a nightmare! I don’t I have a “USB flash drive with backup software & a bootable CD, USB, or DVD with an ISO, for Windows” because this is inside the laptoop. I have another option to “Reset this pc”: but this I cannot keep my personal files and then install the windows. Resuming: I have to options: 1.one isto keep my personal files before format / reinstall windows. As I told you, I don’t have space. The second one is NOT KEEP my personal files. So I think that is one is the option that you mention of bootable disc with backup software. But I don’t’ have a physical CD or USB with this. This is inside my laptop.