Hello,
Have you tried using the hardware troubleshooter?
Here is a link to the troubleshooter and the first page that I would look at inside of the troubleshooter.
http://www.ni.com/support/daq/daq1.htm
http://www.ni.com/support/daq/comprob/2000/brddrv2k.htm
Just let us know if these two options fail to resolve the problem.
Justin T.
National Instruments