You really haven't provided enough information here.
For example, what Version of CAESAR II are you trying to run? Earlier versions were distributed with an Aladdin driver that predates Windows 7, therefore the driver installation fails. Is this your problem - if so visit Aladdin's website and download a later driver.
If you're running 5.20 or 5.30, then the driver should install fine, but it is something to verify. Does Aladdin's "Admin Control Center" work (start this from the IE address bar by typing http://localhost:1947)?
This will be faster if you e-mail TechSupport.
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Regards,
Richard Ay - Consultant