i had the same problem on an hp probook 6560b. given the bsod on first boot that looked like a problem with the the keyboard driver, i decided to have a look at it in the device manager - it appeared to be an hp-proprietary one to enable the app-specific buttons at the top of the keyboard (like the calculator). in the device manager, i "uninstalled" the keyboard (and checked the box to uninstall the driver for it too), and upon converting after that, i had no problems getting the vm to boot up. hope this helps!
wally