Marc P.:For starters please go ahead and fill out your profile with your specific computer specs. Next make sure that you're patched to 10.8 if not it would be best to install that as Studio 10 will only work in vista with the 10.8 patch. Have you tried other sources? Does this particular source work fine when attached to a TV? What are you capturing from and with what capture device (i.e. Dazzle, 710 USB, Moviebox)?
i believe its vista 64, i have installed the studio 10.8 patch, and the vista patch, and im using a Dazzle platinum.