Date: 2018jan3 OS: Windows Q. "The application failed to start because side-by-side-configuration is incorrect" - how to fix an application that gives this error? A. From some quick reading this seems to be caused by DLLs that don't match. Or perhaps a DLL that cannot be found. When one of my applications got this error, I fixed it by removing the dependency on MSVCR80D.DLL I have a page about how to do that. http://davekb.com/search.php?target=MSVCR80D.DLL