A desktop computer processor box (St Albans AL4)

Hi guys,
Am asking for my dad. Does anyone have an old desktop processor box thing not sure of proper name.
He does flight simulating on his as a hobby and his one which was xp has kerput. He is looking for one that has windows 10. A big ask but I know sometime people fix them up and put back on. I can pick at anyone's convenience.
Many thanks 🙏