Error message at running a VC++ program

Hello everybody. I have a major problem about running a program created by me in Microsoft Visual C++ 2010.

I created the program and I put the project into an zip file. I sent it by mail to a friend which has a Windows 7 (32 bit) OS. When he try to run the .exe file (which is in Debug folder), the application starts, he enters some values in those text - boxes, (the program has a few test - boxes and a button. When the user press the button, a result should appear in another text - boxes) and when he press that button, an error appears which sound like that:

"Unhandled exception has occured in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.

Unable to load DLL 'MSVCR100D.dll': the specified module could not be found. (Exception from HRESULT: 0x8007007E). "

What can I do? In that .zip file I've put the entire project of the program. I have to put another files?

Thank you, respectfully.
If that file is not in the .zip, then I believe you do.
Well then where should be that file? I've searched all the folders in my Program Files folder and I can't find it.
This question is littered all over google, why don't you take a look? I've answered this question at least twice on these forums before.
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