Digital Cameras Airport Scanners

Does anyone know how to retrieve pictures from a digital camera when the memory card is corrupted?
The files were readable before and for some reason now they are not viewable. They are still there, but cannot be copied or accessed by the computer (via the USB port) or on the camera itself. the camera is a nikon coolpix 5600.
they show up as a file called g
and also other files with file extensions .rar
I was told by a camera shop that they could be retreived but at a steep price. Some of the pictures are viewable but about 2/3 rds arent but are still taking up memory on the sandisk 1 Gig card.
I cant even drag and drop the files to a hard drive to copy the files to create a back up in case this file retrieval thingy fails. does anyone know what to do or have gone through the same thing? also could airport security scanners have caused this?
thank to all who respond!
You can try to retrieve the photos with Photo Rescue – it’s a utility that’s recommended in some digital photo forums. You can download a trial version here:
http://www.datarescue.com/photorescue/
How our technology spies on us, part four
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