Have you run Measurement & Automation Explorer (MAX) yet? In windows, it'll likely be on the desktop or Start Menu->Programs->Nat'l Inst
You need to do this at least once with the device properly installed before using labview to control it. See: http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/46f78edd19ba0cc386256cee007201fc?OpenDocument