How did you conclude that your Money 2005 installation is missing dbcnv99.dll? Error message? When does the error message appear and exactly what does it say?
If you look in the MNYCoreFiles folder is dbcnv99.dll really not there?
As a first step, try uninstalling Money 2005 and then repeating the download and installation. Let us know if that helps.
Bill Becker