Try a lower number of sources, under 50....At the moment there seems to be an influx of fake files around...Just hang in there you will eventually get your file...One poster said it took 2 weeks before she finally got hers...
Using Bitzi is a good way of telling what a file contains as well
This thread will explain how to use it....
http://www.gnutellaforums.com/showthread.php?t=37676