It is simple, in your code you have the line

#include "graphics.h" or #include <graphics.h>

But the file graphics.h can not be found by the compiler.

If you have graphics.h on your computer then you must make sure that the path where it resides is in the include search path.

This is done through tools->options->projects and solutions->vc++ directories and switch show directories for to include files. Add the path to graphics.h there and then recompile. You must also make sure that any library files are also put into the lib path, this is done by switching show directories for to library files and then putting the path to the library files in there.