There is no way for anyone to help you, unless you provide some more info like e.g. What download client(s) you are using, were they torrents or Gnutella files or some third option, type of files, what your computer setup is and what ISP you use. Pretty much add whatever you think might help in finding an answer to your problem.

That would also make it possible for me to move to the relevant help subsection, where most likely more people may be able to answer, thus getting answers sooner.