If I may start with a gentle warning. This is a public forum and admitting that you may have illegally downloaded a named song is never a good idea. I suggest you edit your posting immediately. And speaking of copyright, the record companies have begun to seed the internet with spoof copies of the more favourite new tracks. These will either not play at all, or play only annoying or abusive messages. Or you may just have been unlucky and have suffered some data corruption during the download which will often prevent you from playing the track. Whatever the cause, I suggest that you throw the file away (I think you have already concluded that it is useless) and obtain a legal copy of it from somewhere.