What you said gave me an idea to go poking around in my Nvidia settings. By setting blender to run in "high performance" mode it fixed the issue. I think it was originally set to use my laptop's internal graphics card for blender, so it was not seeing the Nvidia drives.

Adding that dll does fix the issue, but it also makes blender run about 3x slower, and when I open a large scene blender becomes unresponsive.