"this morning i tried a usb to see if it would load , it started to install . The trouble is it has firefox as the option , how do i remove it and put install windows 10 back"
Please explain this! Was your use created via media creation tool at: Link Removed
I think not if the install demanded firefox one you signed in!
Go to the link and select to download the tool, then install Windows 10 to your USB... And try again!
And since you spent som many hours on doing stuff in, what seems to be, an incorrect manner, please check if you would not gain on Link Removed. Getting proper help might save you many more hours of problem-solving...