You have turned off Norton and the dialog window still doesn't show up? I'm
very surprised by that. Mabye you didn't check off the right option. With
NAV 2006, you must do the following:
Settings->Virus and Spyware Protection Options->Miscellaneous -> 'Turn on
scanning for Microsoft Office Documents' must be unchecked.
or check the check the following article:
http://coffeebear.net/archives/2007/03/26/problems-with-norton-antivirus-2006-and-odbc-connections/
For other versions of NAV (2003, 2007); I don't know for sure. For some
older editions, it was called the Office Plugin or the ActiveScript plugin
or something like that, I don't remember exactly. Maybe you have another
antivirus on your system, too?
However, I can tell with 99% of certainty that your problem is caused by an
antivirus. If your problem is really not caused by an antivirus, then you
should post again but this time, adding the explanation that you have
already checked the antivirus. (Otherwise, someone else will chimne in and
tell you again that it's caused by your antivirus.)