use asoftech photo recovery program to scan your usb and then recover your files.
http://www.asoftech.com/apr/This software scans all storage space on usb and then join pieces together to recover photos. So even virus affected your file table, and put virus to boot sector, the program can still be used to recover your photos.
You need to use a card reader either on your computer or an external USB card reader. Put the card in the card reader, open the recovery program, then select the drive where files are deleted, then press "Start" and wait for it to do it's magic.
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