Om,
Thanks for contacting National Instruments support. Is the issue you are running into in an exmaple vi, or this a vi you are trying to make? Any needed vi's should be there when you install the Modualtion Toolkit. What was your method of installation? Were there any errors or abnormaliites during the install?
Regards,
Kenn North
Principal Product Manager - Search, Digital Analytics
http://ni.com/search