Running programs in other computers

I have written a DLL file in C#, I wrote another application wich uses this DLL file and everthing seems to run fine. The problem comes when I try to run this application in another computer where the visual studio is not installed.

I get an error saying that the mscoree.dll file was not found. I have copied this file to the directory of the program and then I get the error: "A fatal error has ocurred. However, mscorees.dll could not be loaded to display the apropiate error message. Please reinstall the .NET Framework.

What do I have to do in order to have ready an .exe file and that everybody else can run it in their computers