You won't be able to install XP onto a modern computer because of all of the changes to the boot strap process which has completely changed since XP. Plus, you won't be able to find XP drivers.
Before going through all this rigmarole I list...
I have a Asus Expert Centre D700SC computer with Windows 11 installed when bought. What I am trying to do is fit another hdd ( done ) and install windows XP onto it.
I am unable to set the boot to the usb drive that has got windows XP on it. I...