Fine citizens of the Virtualization Nation: I present to you the Windows® Image to Virtual Hard Disk Converter, or WIM2VHD as I like to call it.
WIM2VHD is a tool that will create a bootable VHD from a specified Windows 7 or 2008 R2 WIM image (like the INSTALL.WIM file that ships on the installation DVDs) without having to run Windows Setup. That means that you can a Windows 7 or Windows Server 2008 R2 virtual machine up and running much, much faster.
You can use these VHDs in Virtual PC, Virtual Server, Hyper-V, and … some other things, too. We’ll talk more about that later.
You can get WIM2VHD here.
Source : hypervoria.com/hyper-v