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After installing ArcGIS License Manager 9.3 onto a 64-bit Windows system and running the 'Display Hardware Key Status' tool, the following error appears:
"The SuperPro driver appears to be installed and running. However, the hardware key does not appear to be plugged into a USB port on this system."
The 7.2.2 version of the sentinel hardware key driver, which comes with ArcGIS License Manager, does not always work on 64-bit systems.