-- i copy paste from https://forums.virtualbox.org/viewtopic.php?f=7&t=24426-- Just worked through this (ver 4.0.0) as a tool for testing VistaPE boot disks. I found it was pretty simple once you find the Menus you need. What worked for me was: Use Settings -> Storage -> IDE Controller to setup the Virtual DVD (i.e. ISO DVD Image) Then use the green + sign to add a new device. When prompted to, during the add, browse to the bootable ISO file that is to be used as the Virtual DVD (DVD image) to install. Then make sure the ISO is assigned as the Primary Master for the Virtual DVD. The Storage Form, right panel has the drop-down box to configure devices. You can setup several ISO files and the Host CD drive as primary and secondary virtual devices. By configuring the Primary and Secondary Drive assignments, you can boot from any image or from a physical Host drive. Hope this saves someone some time and results in less wasted DVD blanks.
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