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 ...

When creating a virtual machine, we are sometimes unable to go beyond the insertion of the operating system’s ISO file as the machine folder already exists and can not be overwritten. In this post, we ...

First of all, we need to download the installation media of VirtualBox and then install it on your computer. You can get VirtualBox from virtualbox.org and then run ...