Corrupted download files please download a new copy even after ten downloads

      Corrupted download files please download a new copy even after ten downloads

      I keeps telling me Some installation files are corrupt. Please download a fresh copy and retry installation. I cant get a clean download i have tried older download links i have no idea what is causing this can some one please help me do i need to run some kind of a clean up tool to extract any files im missing from say the first download that may be causing this.