It depends on if you have any hardware that you will be using or
not. If you just want to "play" with the DAQ assitant without any
hardware, you can get the NI DAQmx 8.0 software.
Here is the link for the software:
http://digital.ni.com/softlib.nsf/websearch/4C9E45F6EE5C29F98625708900712CBC?opendocument&node=132060_US
Once the softawre is installed, you should find the DAQ assistant under
the Functions Pallete > Measurement I/O > Ni DAQmx.
Kenny
Kenny