I believe that Brian intended to link to NI-488.2 version 2.2, not 2.1. Version 2.1 would not resolve your issue. The following is a link to NI-488.2 2.2:
http://digital.ni.com/softlib.nsf/websearch/E269BD7F280E068986256E9700660397?opendocument&node=132060_US
Better yet, upgrade your NI-DAQ installation to version 7.2 or higher. Here is a link to NI-DAQ version 7.2:
http://digital.ni.com/softlib.nsf/websearch/50F76C287F531AA786256E7500634BE3?opendocument&node=132060_US
Here is a link to our current drivers webpage (where you may find newer versions of NI-DAQ):
http://digital.ni.com/softlib.nsf/MainPage?ReadForm&node=132010_US
Jeremiah
Staff Product Support Engineer -- Systems Software
http://www.ni.com/ask