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I install Windows from the Dell KACE K2000 appliance, which relies on an answer file to perform an unattended installation. I got the same error message you did, but found a workaround. The solution for me was to go into the Virtual Machine Settings -> Storage, remove the SATA virtual disk, and add an IDE virtual disk. Works flawlessly after that. Good luck. (I know this topic is old, but figured someone might benefit from my response)