Are you using Kazaa or Kazaalite, Serenity?
If you are using Kazaalite, the .dll file you specify is actually a dummy file which has to be present for Kazaalite to work. It may be that you have protected the file using AdAware or another Anti-Spyware program, as they do pick it up. If you do have Adaware, I would first check to see that is hasn't been protected by the program.