Hi Ranjeeta,
Thank you for using National Instruments Forums. Do you have Measurement and Automation Explorer (MAX)? If you look inside MAX, you should see if your device shows up there. If your device is not showing up you are most likely missing the drivers. Our drivers can be downloaded from here:
http://joule.ni.com/nidu/cds/view/p/id/490/lang/en
This is NI-Motion 6.1.5 which is compatiable with LabVIEW 6i. Let me know if you need any more assitance with our drivers.
Justin Louie