Which client are you using & what version?

Does this happen with all audio files that you search for?

If all files that you search for show as downloading, when you haven't chosen to download them, scan your computer for malware.
Update your AV & do a full scan, also scan for ad/spyware.
There are links to some good free apps in this thread: http://www.gnutellaforums.com/open-d...uld-aware.html