Ack!! That sounds bad.
If no one offers a solution, have you tried calling enTourage? Seems odd, too, that your PE powered down during a transfer . . . how did that happen??
Can you use a micro-sd card for all your storage now, or do you need access to some of the files on the internal card even so? (I don't really know much about tech, I just like using it!
Wish I had a real answer for you.