Get yourself RivaTuner and use the D3Doverider tool within to enable Vsync for BS. Only tested on Windows7 but it should also work with Vista.
http://www.guru3d.com/index.php?page=rivatuner
You could try this page but I'm not sure how an ISO torrent works. See the bottom of the first post.
http://www.sas1946.com/main/index.php/topic,2717.0.html
@ Jim - When you said it was fudged above 5000ft, did you mean the draw distance?