You seem to have misunderstood the nature of the problem.
After following the steps you mention, to wit
unzipping, installing software, restarting, plugging in card, then starting up, the card is NOT RECOGNIZED
AS AN NI CARD because the software install gives an
error the depth of which is sufficient to obviate all further progress. The NI .dlls which in fact ARE installed by the 2.0 software (contrary to your irksome statement), do not make it onto my system due to this error. Without these .dlls the card is only seen as an 'unknown pci device'.
I should perhaps mention that despite the bungling 'help' given by both local and overseas
'support', I managed to get the device working by erasing my hard drive, reinstalling windows, and resintall
ing the 2.0 drivers. Error 0 remains an untrammeled mystery.