The LabVIEW Player is a stand-alone executable that can view any VI's that have been "signed" for viewing. The toolkit that allows you to "sign" VI's is only available for LabVIEW 6i, but you don't need any additional NI software to just view programs.
More information about the LabVIEW Player can be found at:
http://www.ni.com/labview/lv_player2.htm
