The reason is because the file is in fact "Corrupted". At one point it downloads the same thing over and over again because the file has been Corrupted/Decompressed incorrectly/having other applications open during decompression. no applications should be open when decompressing, and u should never open an application/program while decompressing! This is what causes ur problem. nothings worse than waiting to download a 300 some odd mega bytes of songs/movies or whatever and finding out it downloaded the same thing over and over again.