James, it sounds like you are having permission issues.
First, it was unable to remove the PXE file, now it cannot move image files?
The error that said it was unable to move the file told you WHY it couldn’t move the file. What was the full error message?
To fix this one
I would power off the uploading machine
Cancel the task in FOG
Manually move the image
Find and fix your system issues
[*]Life goes on