The "Bootable" legacy ISO you've used is in fact not bootable, it relies on CDROM emulation provided by BIOS. VMs don't usually do this sort of emulation. If you set the guest OS to something like ...

Make Tech Easier shows us how to get up and running with VirtualBox from a bootable USB drive. To do this, you'll need a bootable USB drive (obviously) and you'll need to be comfortable using command ...

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 software that runs on Windows, OS X, Linux, and Solaris, capable of full virtualization. Full virtualization allows VirtualBox to run OSes entirely different than the OS it is running on ...