The development machine will have all DLLs needed for the debug and the release versions you produce. If you move the plug-ins to a machine without the Visual Studio tools installed, it will not have the debug DLLs and might not have the run-time DLLs. You can fetch the run-time DLLs from the Microsoft download site:
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=5555
