I downloaded the Windows download of "Image for creating a bootable USB drive" from the memtest86.com website at this URL: http://www.memtest86.com/download.htm (the ...
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 ...