Hi all,

I had an application written in VB that uses ADO1.5. When i installed visio 2000 in that PC, the ADO got upgraded to ADO2.1 and the application failed to start, stating illegal exception error in file MSado15.dll. I manually unregistered the files msado15.dll and msador15.dll (of version 2.1), renamed and copied the same files of version 1.5 , registered the version, and started the application and it was found to be working.Then i uninstalled the Visio.


Later, i again installed the Visio and found the application to be working. I checked the ADO version and it was 1.5 and not upgraded to ADO2.1

I am very much confused with this behaviour and i can't recompile my application to work with ADO2.1 or greater due to some other problem.

Can any one can explain the following:

Why the app failed to work with ADO 2.1?
Why the Visio did not upgrade the ADO second time?

Regards