We have heard several people stating that it's impossible to convert an Hyper-V VHD based image to Virtual PC format, We found a way to do it, basically you need to remove integration services (Hyper-V Guest components) before copy vhd, then replace hal.dll. STEP BY STEP INSTRUCTIONS 1) Before you copy VHD file, REMOVE Hyper-V Integration Services (Hyper-V Guest Components) 2) Stop the Virtual Machine and copy the VHD file (let's call VirtualMachine1.vhd) 3) Start another virtual machine inside Virtual PC with same OS and use as a Secondary Disk the previous copied file (VirtualMachine1.vhd) - You need to mount the drive after the OS is booted up 4) Using Windows Explorer from the previous started virtual machine open the Secondary Disk (let's suppose it's recognized as E:) 5) Replace hal.dll from the secondary disk (E:\WINDOWS\system32\HAL.DLL) using the file present into C: Partition - C:\WINDOWS\system32\HAL.DLL 6) Don't install ACPI drivers More details about HAL.DLL file on: http://support.microsoft.com/kb/309283