I use LabVIEW 7.1 but I have some problem when, I use LabVEW to read the data from serial communication

I use LabVIEW 7.1 but I have some problem when, I use LabVEW to read the data from serial communication.
I use LabVIEW to read the data from serial communication then, i open the example (.vi) from Serial Communication - Advanced Serial Write and Read  from LabVIEW Example. BUT it have some error message that : Error - 1073807202 occured  at property node in visa configure serial port (instr).vi -> advance serial write and read .vi
this error code is undefined. no one has provide a description for this code, or you might have wired a number that is not an error code to the error code input.
I don't know why? please help me. thank you.

When I copy that code into "Explain Error" I get: "VISA:  (Hex 0xBFFF009E) A code library required by VISA could not be located or loaded."
You may have a bad install of VISA or the wrong version of VISA loaded. Try re-installing VISA. You can get the latest version from the NI support site: http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BBB002C0E91?opendocument&node=1....
Also ensure that you are not pointing the example towards a serial port that does not exist.
Please let us know what you find and what gets this working for you.
     Rob

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