And, like the other user, it went fine with VirtualBox. I'm at the desktop, and letting it install the Multimedia audio device.

I am having the same issue. I created a Hyper-V vm, with no network card, and used the IDE controller to add hdd1.vhd (1 GB, .vhd). I don't see any options for setting partition type (so hopefully it's MBR). I set the DVD drive to point to the ReactOS-0.4.13.iso file. When it boots, it flashes "...