Martha,
I'm pretty sure you can just copy the working mscal.ocx to the other machine. I have one on my machine I renamed badmscal.ocx it's version 10.0.0.2601 (rightclick the ocx, select properties and look at the version page. The good working one for me is version 10.0.0.6308.
>Additional information...
>
>...I had the user do a search at the command prompt on each of the machines. This is what he found (in the order found)...
>
>Machine #1 (where it fails)
>directory c:\program files\Microsoft Office\Office10
>2/1/01 11:32 pm 114688 bytes
>directory c:\windows\system32
>10/11/05 12:53 pm 89600 bytes (the one installed when I loaded the program)
>
>Machine #2 (works fine)
>directory c:\winnt\system32
>10/11/05 12:53 pm 89600 bytes (the one installed when I loaded the program)
>directory c:\program files\Microsoft Office\Office
>1/14/00 11:07 pm 111544 bytes
>
>Any suggestions are greatly appreciated.