Did you make the setup program and are trying to transfer to another machine? If so
did you add the file to the setup list. If you received this program from another source
check to see if the ocx is listed in the setup list, it should be, next check the version number against the ocx on the machine you are trying to transfer to against the version listed in the VB IDE, use explorer to get the files date.
Finally try unregistering the ocx and then re-registering it.