Hello,
with the information you provide I cannot be sure on what may be going on. I recommend you to visit this page and check for possible issues that may be happening:
http://www.ni.com/support/fieldpoint/default.htm
www.ni.com/support/install
It would be smart to follow the configuration steps from the beginning (reinstall from scratch), and see what happens.
If exploring those pages doesn't help you, it's advisable to contact your local National Instruments office.
Regards,
Jorge M.