This is not Symantec Support - you would need to log a call to speak with them, as these forums are predominately for users to help other users.
Does your hardware contain any SATA devices, such as the hard disk?
If so, you are not going to be able to access the disk using DOS, as there are no DOS drivers for SATA devices that I am aware of.
Imaging modern hardware really requires you to use WinPE as your boot environment, as this has native support for some SATA devices and can load Vista drivers for newer SATA chipsets.
As a check, if your hardware does have a SATA hard disk, check the bios and see if the hard disk can have AHCI switched off, and IDE Compatibility mode switched on. With IDE compatibility mode enabled, you may be able to get somewhat further in restoring an image.