EEPC does not know anything about files, so it was unlikely to be that which directly caused the problem.
What version of EEPC are you usin though? Perhaps the user logged on using a different profile?
You're right SafeBoot. Because username that the same between workgroup and domain so i didn't see!
You can recover lost files with data recovery tool, see this guide: desktop data recovery
the guide helped me before, easy to use and works well. hope that it helps you.