The whole "I was hacked" story doesn't hold much water; however, it is possible to lose control of your media files through file sharing software.
Several years ago, I downloaded a popular file-sharing program and installed it in order to download a patch for an MMO that was in torrent form (official patch servers were down). I started the download and went to bed. When I woke up, I discovered that over the course of the night I had uploaded about 10gb of files because the software automatically searched my hard drive for sharable media and allowed other users to download it. It wasn't just .mp3s. Lots of .pdfs, .docs, .xls, and the like were taken. Fortunately there was no banking or significant personal information stored on the computer, but I had a heart attack nonetheless.
I was really mad about it for a while, but I eventually concluded that I got what was coming to me for dabbling in that sort of thing.