MSAdodc.ocx missing

I have written a program which connects to the database .
It runs well in my machine but when I try to run its exe in another machine elsewhere ,it gives an error
"MSAdodc.ocx missing".(though it doesn't occur in all machines ,just some)
What could be the problem?

Are you doing a complete install process on the other machines or are you just trying to run the executable? Programs such as InstallShield, the deployment wizard, and other setup programs will detect which .ocx files need to be included in the setup package. If you are just running the .exe on the other computers, then that is the problem because the executable does not contain the needed .ocx and .dll files. If you are creating an install package, whatever program you use to create the setup program should list all of the files that are to be included with the setup package. Make sure that MSAdodc.ocx is in that list