Hmm... Not sure where you're getting your Info, but you may consider a different source.
The Gnutella Network is Loaded with Viruses, Worms, Trojans, Spam, Fakes, and Corrupt Files. Prolly what you're finding.
Here are a few Links that will help combat some of these issues and will show what to look out for.
* WARNING: Viruses on network you should be aware of ! * good file or bad file
This will help get you started.
And welcome to the Gnutella Forums.