I'm developing an app that execute another app and I received this error:
the program can't start because MSVCR100.dll is missing from your computer
with my C# app, can I fix this problem copying this .dll into windows/system32 folder? Or exists another method to do this?
This links below point to the proper downloads for the MSVCRT100 installer. This is likely what you want your customers to run before installing your app. This will properly install the MSVCRT DLLs in the proper directory such that all applications can use it.
Microsoft Visual C++ 2010 Redistributable Package (x86) (probably what you need for 32-bit and 64-bit os)
Microsoft Visual C++ 2010 Redistributable Package (x64) (Only if your app itself is 64-bit)
If you actually want to install the MSVCRT100 DLLs through a merge module within your own MSI - you can link your MSI to the MSMs that are located in the x86 version your "c:\program files\common files\merge modules" directory" (Assuming you have Visual Studio 2010 installed).
C:\Program Files (x86)\Common Files\Merge Modules>dir *CRT*.msm
Volume in drive C has no label.
Volume Serial Number is 60A4-1718
Directory of C:\Program Files (x86)\Common Files\Merge Modules
04/22/2011 01:18 PM 584,192 Microsoft_VC100_CRT_x64.msm
04/22/2011 01:41 PM 571,904 Microsoft_VC100_CRT_x86.msm <-- This is likely the MSM you want if your app is 32-bit.
04/22/2011 01:14 PM 847,360 Microsoft_VC100_DebugCRT_x64.msm
04/22/2011 01:39 PM 801,792 Microsoft_VC100_DebugCRT_x86.msm
Two other alternatives: Instead of copying MSVCRT100.dll into a system directory, copy it into the directory of the EXE app you are trying to launch that depends on this DLL. This isn't recommended, but won't run the risk of breaking other apps.
Another alternative. If you actually have the source code to the EXE that you are trying to launch, you can completely bypass all of this "install msvcrt100.dll" noise by just statically linking to it. In visual studio, it's the option in the project's propery dialog under C/C++ (under the Code Generation tab). Change "runtime library" from "Multi-threaded Dll" to just "Multi-threaded". This adds the /MT compiler switch.
Whatever program you're trying to start has to be properly installed first. Msvcr100.dll is one of the DLLs that need to be deployed for programs written in C or C++ with VS2010. It is simple with a Setup and Deployment project or by building the program with the /MT option. Contact the program owner for support.
what is missing is the Visual C++ runtime.
are you starting a C++ application from your C# code? if so, make sure the proper runtime is available on the client machines.
You should be able to fix this by copying it and registering it (with command line: regsvr32 "DLLNAME") or you can ship it with your executable and it should work
WARNING: Please consult the following article before including the file with your software... http://msdn.microsoft.com/en-us/library/ms235299.aspx
I take no responsibility for your actions
来源：https://stackoverflow.com/questions/6956747/c-sharp-missing-msvcr100-dll