Corrupt file repair

Hi all;
I have a divx reader with hard disk connected by a wireless network to my PC: while I was renaming some folders the network went down and the folders become files, so now are unreadable.
Now, when I connect the network drive, in the left column I have 8 folders (instead of the 10 that I had before) and two files of 0kb.
Before this problem these two files were two folders containing hundreds of files.
How can I restore them? remember that I don't have a physical access to the drive, only by network.
Thank you
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