SUCCESS!!!
We didn't have to use the USB/Hard drive reader. We were able to hook it up to his Computer using "Windows". It took about 4 hours to move all the files over. "Windows" was able to locate the "bad files" and we deleted them. Two ".MOV" files were the culprits. His computer shut down twice in the process. Once for each bad file, I presume? He's going to try to re-format the HD to see if it's any good, but it's old and almost obsolete at this point. Happy to say I got to keep all my old "Home Movies".