Chances are the ESL drivers are outdated: the CAESAR II v4.3 was written before the Win XP existed. Go to Support -> Downloads, Miscellaneous Files, and get the HASP Driver V4.95 Install Utility (HDD32.EXE). Install it on the computer where the CAESAR II is loaded and also on the computer where you run CAESAR II from (if CAESAR II is installed somewhere on a centralized machine/server). If the ESL device that you have is network (red), you may need to update the License Manager as well...
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Nadia Strikovski
Intergraph CAS