Automation/Expected Interface

Here is my scenario...

I have a program that uses a dll named mail.dll that I created, and also ado15.dll and scrrun.dll.

I tested it on several machines and it works on all but one.
They all have windows98 second edition.

The machine it doesn't work on gives me a "class does not support automation or expected interface" error. I tried reinstalling windows but that didn't work either.

If I remove the scrrun.dll from my program, I can then run it on that machine with no problems. I checked if this dll is installed and it was so I have no idea what the problem is. Please help!!!!!!!!!!!!!!

Thanks