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 ...

Even if you’re a Windows fan, you’ve probably thought about trying OS X. Maybe you’d like to test drive OS X before switching to a Mac or building a Hackintosh, or maybe you just want to run that one ...

Virtual machines can seem juuuuust a bit too geeky for most otherwise computer-friendly people. That's sad, because it's an easy, free way to try another operating system, or use those one or two apps ...