Jthomas,
It sounds like the winpe environment may be corrupted...
Are you running any anti-virus's on your GSS server?
To re-import the winpe.. Close ghost, disable anti-virus (if applicable and only temporarily) and navigate to
C:\Program Files (x86)\Altiris\eXpress\Deployment Server and delete the waik_winpe10 folder
Open GSS and navigate to Tools->Boot Disc Creator, then Tools->Install Pre-Boot Operating Systems and import winpe10.
After this completes you will need to re-install your automation folder on the client machine before attempting imaging again.