Windows boot manager

So something strange seems to be happening with a computer currently. I recently built a new computer from scrap parts found where my dad works and some older parts I used to have. It seems to work just fine except for one mayor thing. I can not get windows 10 to work. I used a usb stick with windows 10 pro on it and the computer booted just fine. Then I put in all settings, deleted the old drive so it was empty, and then I downloaded windows. When the download was finished I was surprised to see me back at the installation screen again. So I quit and when I returned nothing was booting. I reinstalled it several times and nothing seemed to work. It found my hard drive just fine and there were windows files when I checked when reinstalling so it did install something. I even went so far that I used another harddrive and the same problem occured. Then when messing around I used windows boot manager to launch it seems to actually work. I got the settings screen and changed the data collection but when I then restarted my computer it went back to the same issue. It seems like I can only start windows from the boot manager. How can I fix this?