Sounds like a virus. Point 4 in this thread deals with it
http://www.gnutellaforums.com/showth...threadid=41432

There's a lot of good advice in there & a link to Norbiesworld.
If you can't get rid of this thing, he'll be able to help you.

Make sure you take care with what you download. Have a good AV program & keep it updated. Always scan a file before you open it.