I encountered this error when I upgraded my office computer to Access 2010. Apparently I made a small change to the database that I use for client accounting and billing. I developed this database many years ago In a prior version of Access and I am no longer familiar with programming. My secretary has Access 2003, and when she attempted to open a replica of the billing database she received the above error. I copied acedao.dll from my computer and placed it in a subdirectory on her computer. In Access 2003 I referenced the Microsoft Access 14.0 Object Library, and the database runs.
Unfortunately when I close Access 2003 and reopen the database, the 14.0 Object Library appears as "MISSING" again. How can I register it permanently?