Here's a link to the Wiki page about Rhino on Vista. What they've done right now is set it up that Rhino can run with OpenGL on Windows, and with DirectX on Vista. This is only temporary. McNeel is hoping to have Rhino running properly on Vista soon, but that also depends on how Microsoft fixes the mess they've created for 3D programs...
http://en.wiki.mcneel.com/default.as...noOnVista.html