Trouble installing Rhino.net

Hello,

I am having trouble installing Rhino.net. As the "readme" in the zip package explains, I added the RMA.visualstudiowizards.dll to my assembly cache. Then I ran the RhinoDotNetWizards.vsi and there was an error. It couldn't install the Rhino.Net VB or C++. The error reads

"Installation stopped because the directory for the ProjectType value did not exist.  The project type is invalid for your installation of Visual Studio."

Any ideas?

Thanks,

Ben