What is your download bandwidth set at? I know that i sometimes have trouble downloading items (not movies or music hardley bother with them),It's varies, from one source it'll download at 1-2kbs and from another it'll download at 30-50kbs
I myself have waited days upon end while a file downloads at 1kbs only to have the source go off line after about 20 mins everytime....OR the worst one...get to 99% and they stop sharing the file and kill the download,believe me this has happened once or twice!