I've been using GHOST since its originally release from Binary Research, years before it was acquired by Symantec and having used Symantec Ghost Solution Suite 2.5 for some time now I'll be upgrading to Symantec System Recovery software since GHOST has now been discontinued even though supported through the middle of next year.
Anyway I've mention this because I'd like to understand why you're copying the Ghost Image into the Virtual Machine to be restored elsewhere? Why not just pull it from its stored location to the system it's being restored to?
I was going to mention something similar to what André mentioned if you have no other choice but to have it in the VM and that is to add an additional virtual hard disk and do as André suggested by formatting it and setting up any folders and then change its type to "independent-nonpersistent". What this would do is allow you to boot the VM copy the Ghost Image to the "independent-nonpersistent" disk... Ghost it to the other system and when you shutdown the VM the virtual disk is reset to the state it was when originally set to "independent-nonpersistent" thus automatically cleaning up behind itself if you will.
You'd have to manually edit the .vmx configuration file adding the following option:
scsi#:#.mode = "independent-nonpersistent"
Or
ide#:#.mode = "independent-nonpersistent"
Where '#' is the corresponding numbers for the target disk.