They might not be shared by anybody or they're offline at the time you try or they're too difficult to connect to or they're too busy (upld slots full), or they use other gnutella clients such as Shareaza or Morpheus which are multinetwork programs & usually spend most of their upload capacities upon those 'other' networks. That's why clients like Shareaza (RAZA) are often difficult to connect to or give very very slow upld speeds such as 0.1 -3 KB/s. If you control-click the top of the downld window bar or the results bar, a drop down menu will appear giving you extra view options. One of them is Vendor/Version which if selected, will show an extra column which will show which client you are downlding from.

My advice is to see the following link & follow "ALL" the off-shoot links to find hints & extra skills to help solve your problem: To continue files downlding (click on link) (apologies, sample images are not showing on the forum at the moment & might be inactive for a few more days yet!)