"The program can't start because MSVCP120.dll is missing from your computer."

I am making an an app on C++, after i compiled it it works just fine on my computer everything is perfect. However when anyone else runs the .exe from their computer the following message pops up.

The program can't start because MSVCP120.dll is missing from your computer. Try reinstalling the program to fix this problem.

I asked him to manually download and copy the .dll into his System32, and reboot. He did so and it is still not working. I don't even know where in the program to look for an error, I had never encountered this before, I can upload any part of the code asked for.

EDIT: I have tried changing the Runtime Library from Multi-threaded DLL to Multi-threaded, but i am still having the problem. I am trying to keep it to just an .exe file. I thought about the installer but was hoping there was a way to keep it to just one .exe file.