It's a virus. Info here
http://www.gnutellaforums.com/showth...threadid=39612
and point 4 here
http://www.gnutellaforums.com/showth...threadid=41432
The second thread has lots of info & advice about virus probs. It also has a link to norbiesworld. If you go to his site & register ( it's free), he'll help you to get rid of the virus.
Please make sure that you have a good, up to date AV program. Scan a file
before opening it