http://www.fixedbyvonnie.com/2014/11/virtualbox-showing-32-bit-guest-versions-64-bit-host-os/
ref - https://superuser.com/questions/866962/why-does-virtualbox-only-have-32-bit-option-no-64-bit-option-on-windows-7
#x86
origin - https://www.pipiscrew.com/2019/02/why-is-virtualbox-only-showing-32-bit-guest-versions-on-my-64-bit-host-os/ why-is-virtualbox-only-showing-32-bit-guest-versions-on-my-64-bit-host-os