Chris:
National Instruments has a Knowledge Base article (1V982Q8M) available on this topic that explains how to add the Measurement Studio classes step-by-step.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/0cb6707522e92c958625689e0052bb77?OpenDocument&Highlight=2,1V982Q8M
National Instruments is working on making this process easier with future versions of Measurement Studio.
Regards,
Chris Wood
Applications Engineer
National Instruments"