>Chuck,
>
>Can you register it manually using MSDOS window:
>
>Regsvr32.exe C:\winnt\system32\mscal.ocx
>
>If so the problem sounds more to do with Install Shield. If it is a corrupt OCX then unregister it and try copying the file again.

You can register it manually by regsvr32.exe.
I once had an Active X control that wouldn't work right. No matter what I tried. It turned out the registry for the control was the problem. So nomatter how many times I tried to register it that didn't fix the registry
until I unregistered it and then registered it.