Hello,
Thank you for using our toolbox!
Looks like the setup tries to install the toolbox in the "*:\MBDToolbox" path which is not valid.
When installing the toolbox, at the Destination Folder step you can press the Change... button and select a valid path.

If you have any other trouble when you setup our toolbox, please follow this Video Link : 7692 video.
Hope this helps,
Marius