Ok then, have a look through this thread. It's about using 3GP converter & 1337 gives some really good instructions plus screenshots. That's how I found out how to use 3GP. There's a link for download somewhere there as well. Have a try with that one & see how you go...it's really easy to use.
http://www.gnutellaforums.com/showth...=&pagenumber=1
Just remember that if you haven't changed the default location of your saved files (where your downloads live), your files will be here:
C:\Documents and Settings\your username\Shared.
So that's the place you have to look for files when you want to add them for converting, or add them to iTunes etc.