Corrupted MP3 files (and other file tyes too) can be a pain. I'd say that out of every 50 successful files there is usual 1 that has been corrupted (in my experience). Most commonly, I've encountered a corrupt file if it has been downloaded from large multiple sources (eg. over 100 hosts sharing that file because it is VERY popular). Just one corrupt host can cause it to fail. I've found that sometimes, if you click to continue and the file completes (this is not always the case) the corrupted file is still playable (I use iTunes) but you get the odd click or some other form of distortion. Sometimes the corruption cannot be audibly heard but sometimes it might not play at all (click play and it jumps to the end of the song). If you have a very large percentage of corrupt files are you trying repeatedly for these same files? Try selecting those tracks that have a different bitrate or file size to ensure you are not selecting the same file from a different host.