We had been using the old msado15.dll in our program . And we used to import it #import "msado15.dll" . Now just a few days back we upgraded to Windows 8. And alas, our software stopped working on Windows 7 which didnt have Service pack 1 installed. Earlier when we were using Windows 7 we had upgraded to Service pack 1 and the same problem was happening so we uninstalled the service pack 1 for windows 7 from all machines and everything worked fine.We had been using the old msado15.dll in our pr