If you go back to the Hardware Acceleration item is it turned to full or to none? If it is still on full you don't have administrative access rights to your computer, which you need to change this setting. Without changing that setting the input might not run. You can try something additional within Caesar II. Select Tools->Configure/Setup->3D Viewer Settings and change the Video Driver to Windows Basic Video and then Exit w/Save. Then try to go to input again. Look on your CD for the version and build information.
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Loren Brown
Director of Technical Support
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine
12777 Jones Road, Ste. 480, Houston, TX 77070 USA