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The shared CRT DLL has been distributed by Microsoft in the past as a shared system component. This may cause problems when you run applications that are linked to a different version of the CRT on computers that do not have the correct versions of the CRT DLL installed. This is commonly referred to as the "DLL Conflict" problem.

To address this issue, the CRT DLL is no longer considered a system file, therefore, distribute the CRT DLL with any application that relies on it. Because it is no longer a system component, install it in your applications Program Files directory with other application-specific code. This prevents your application from using other versions of the CRT library that may be installed on the system paths.

For Msvcr70.dll or for Msvcr71.dll, you should install the CRT DLL into your application program files directory. You should not install these files into the Windows system directories. For Msvcr80.dll and for Msvcr90.dll, you should install the CRT as Windows side-by-side assemblies.