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Microsoft KB Archive/925209

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Knowledge Base

Error message when you try to install the MSDE part of Small Business Accounting: "MainEngineThread is returning 1603"

Article ID: 925209

Article Last Modified on 10/23/2007


  • Microsoft Office Small Business Accounting 2006


When you try to install the Microsoft SQL Server Desktop Engine (MSDE) part of Microsoft Office Small Business Accounting, you may receive the following message:

Error: MainEngineThread is returning 1603
Failed to connect to server. Error: 0x800401F0


This problem occurs because an instance of SQL Server was previously installed and was not completely uninstalled from the registry and from the Program Files folder.


To resolve this problem, completely uninstall Small Business Accounting and SQL Server from the computer. For more information about how to do this, click the following article number to view the article in the Microsoft Knowledge Base:

897877 How to completely remove Small Business Accounting and Microsoft SQL Server Desktop Engine

Then, reinstall Small Business Accounting.

Keywords: kbtshoot kbmbsmigrate kbprb KB925209