So, Windows starts to boot, and then reboots in the middle?
Last I remember, you couldn't switch certain hardware with Windows. There is a significant change going from a VM to actual hardware, so Windows is probably crashing due to the hardware change. Although, IIRC, it would give a STOP error, not reboot.
See the section on Replacing a Failed Motherboard, this may help you. http://support.microsoft.com/kb/824125