vhd install windows 8

after downloading the window8 (and converting to usb stick )
Insert and reboot
Follow the installation wizard until you get to the point where to select the partition
Hit Shift + F10 to bring up a Dos prompt window.
Type diskpart and press enter. Then,
DISKPART:>create vdisk file=C:\vhd\win8preview.vhd maximum=20000
DISKPART:>select vdisk file=C:\vhd\win8preview.vhd
DISKPART:>attach vdisk
exit and refresh
choose the new disk, ignore any errors about unable to boot