In the search results, control-click the top column bar of the results & choose to show vendor. This will show you which gnutella program client is offering it. If it's RAZA (Shareaza), be wary. People who use raza usually connect to more than one network at a time & use most of their upload bandwidth on the other networks. This makes them very difficult to connect to & even when you can, often only offer a miserly speed.
You might want to see tips here for finding alternative sources & versions under varying names:
Can’t search well help
Also, try browsing host to see if that helps re-starting the downld. Re-searching also does the trick particularly as new people come & go online all the time.