There are files that cannot be downloaded 100%, for example if the initial source vanished before 100% of the file data has been uploaded to the network.

Also, you might have been downloading fake downloads (there are companies with multimillions of dollars that are only there to disrupt and spam in P2P networks or annoy the users in any other kind of way)

BTW, some general things you should always respect when downloading with Shareaza:
a) Make sure you have at least the G2 and eD2k networks enabled.
b) Make sure whatever file you're downloading has more than 3 or 4 sources; one of them at least on G2
c) Make sure the file you're selecting for download does display meta data (this requires 1 G2 source at least) in the search window and has a possibly correct file size (so a video file with some few KBs of size is most probably a fake, for example)

If you respect those two things, you get much better downloads in average

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</td><td><a href="http://crawler.trillinux.org"><img align="right" style="border:0" src="http://crawler.trillinux.org/img/netsize.png" alt="Network size"></a></td></table>