The only files I can never find are the ones that itunes has squirreled away somewhere. Even tho' I have always checked the "keep itunes media folder organised" box AND the "copy files to media folder" box, itunes has never kept the files where it says it keeps them.
I found this probalem in XP SP3 and in 7/64.
So if I can't find them, I can't copy them.
At least the cable/software upgrade method found all/most of my music files.
PS .This post is not a request for a "how to". I am quite content in my ignorance.