Converting between virtual and physical machines as well as different versions of virtual platform can introduce all kinds of headaches, primarily as a result of the HAL (Hardware Abstraction Layer).
I simply wanted to move a Hyper-V image to Virtual PC or Windows 7 and found the image wouldn't boot. Some quick research cam up with a lot of cans and can'ts; e.g. http://blogs.technet.com/b/jhoward/archive/2008/02/28/are-vhds-compatible-between-hyper-v-and-virtual-server-and-virtual-pc.aspx while Virtual PC Guy provided some more details: http://blogs.msdn.com/b/virtual_pc_guy/archive/2004/12/16/316643.aspx
However, a quick and easy approach if your image happens to be Windows Server 2008 R2 is to simple set the boot flag to automatically detect the HAL on bot via MSCONFIG:
http://www.networkworld.com/community/node/30960Incredibly helpful and useful to know.
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