Okay Happy New Year. Computers do not get confused at least not at the point you are at or should be at. If you have a valid Windows 10 disk then whatever is on your hard drive, Windows wise, is irrelevant. The disk should boot before your hard disk and install Windows 10. To be honest I think it time that you took your computer to your friendly local computer guy. Without being horrible what you/we are trying to do is quite a difficult operation unless you know what you are doing. I really do not think that your knowledge of computers is sufficient enough for you to understand what I am trying to tell you. All this stuff is on the internet but as I say without some computer knowledge it can be difficult to understand. You can try Microsoft but I do not think they will be of any help even if you could understand what they are saying. But in all honesty I think it's either time for you do some serious internet research, very sharp learning curve initially, or take your computer to your local computer shop.