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LabVIEW 6.1 is compatible with Windows XP. The DAQ VIs may be missing since they are intalled by the DAQ driver. If you do have the driver installed is just a matter of runnign the NI-DAQ installer again from Add/Remove programs, select modify and make sure that support for LabVIEW 6.1 is selected. This should bring the DAQ VIs back up.