Skip to the end for instructions. I had been trying to install Windows 10 Pro Technical Preview onto a VHD, as I have Windows 7 Ultimate and can run an operating system from VHD (this feature is apparently limited to Enterprise and Ultimate editions). While I had successfully managed to install it on a virtual machine in Oracle VirtualBox, I was dissatisfied with the sluggish performance of a VM. At the same time, I also did not want to dedicate a real hard disk partition for the sole purpose of installing Windows 10 TP. Hence the decision to install into a VHD, which is a very neat solution that lets me keep Windows 10 TP separate from my real hard disk partitions and still enjoy the full native speeds of my real hardware. I had previously installed Windows 8 RC successfully into a VHD so I knew what I was up against. Or so I thought. As soon as I booted up the setup disk (the ISO I had downloaded) and clicked on Install Now, I received this very unhelpful error asking for de
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