Sorry you're having problems. I did get Frostwire to work with Vista then decided to try LW pro again since it has access to 5 peers instead of 4. Since FW files interfer with LW I uninstalled it. From then on I could not get either to work... though I suppose I eventually will. I looked up BearShare and its relationship to iMesh. Neither are open source and both seem to have settled with the RIAA. That's enough for me not to trust either.

BearShare - Wikipedia, the free encyclopedia
IMesh - Wikipedia, the free encyclopedia