error, AIHARD.lsb missing

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While
loading my VIs, I receive an error saying that
AIHARD.lsb could not be found. This problem
causes all AI library VIs not to working.
what should i do?

[Evan]

Take a look at this developer zone thread
AIHARD.lsb not found error

Although I would try to re-install NI-DAQ first and maybe upgrade your version to a more current version of NI-DAQ.