Hyper-V Program Manager
Virtual Server 2005 R2 Service Pack 1 beta 2 includes a utility to mount virtual hard disks on your physical computer - called VHDMount. However there are some issues using VHDMount on Windows XP:
Never fear - this second issue will be resolved in the final release when the driver is going to be officially signed.
Cannot start device (Code 10) error on mounting can be caused by having the
virtual disk file on a non-native Windows partition (e.g. mine was on an ext2fs
volume served to Windows XP by the (excellent) Ext2 IFS driver). Moving the VHD to
a FAT32 partition solved the issue.