Compiled .dll files requiring msvcr100.dll to load

I have a dll file compiled in MSVC++ 2010. It doesn't require any other extra library, yet only half of its users can load it because some are missing msvcr100.dll. Looking at the dependencies, it is开发者_JS百科 requiring some basic functions like memcpy free malloc, though I thought those were standard C runtime functions. The code generation setting is set to "Multi-Threaded /MT" in the properties. What could be causing this?

My solution was deleting the dll from Windwos\System32 and reinstalling the Microsoft Visual C++ 2010 Redistributable Package (x86).

http://www.microsoft.com/downloads/details.aspx?FamilyID=a7b7a05e-6de6-4d3a-a423-37bf0912db84&displaylang=en