I don't think Virtualbox has a UEFI option, so I think virtualbox is (rightly) booting legacy. But still it can't boot from that ISO I just tried VMWare Player I notice that one can choose UEFI or not ...

If you are trying to install Windows in VirtualBox but receive FATAL, No bootable medium found, System halted error continuously, here is what you can do to fix the ...

Virtualbox is a great app for using different operating systems on your PC, so here's how to get a fresh virtual machine set up and running.