Hi Anand,
Have you tried running one of the sample applications that come packaged with LV 7.1? In particular, try running the example titled "Sample Report (Word).vi". It uses the high level VIs to create a Word Document, including a table that is populated with data. If that works, I would look into comparing that example with your code and see what they have done differently.
Jeremy L.
National Instruments
Jeremy L.
National Instruments