Can't retrieve backed up files but can see them?

I finally need a back up after a HDD wouldn’t come out of a windows repair.  However it appears like I have files with titles of songs and files but when I click them they have a size of zero mb.  I can see that I have saved approx 600Mb as drive shows only 1.4Gb remaining on my 2Gb ext hdd.  Help??

What backup program did you used to backup your files? Or did you moved them manually?