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Which version of OpenCV are you using? Try using the latest openCV stable version 2.4.5 and use the C++ style API.

#include "stdafx.h"
#include "opencv/highgui/highgui.hpp"
#include "opencv2/core/core.hpp"

int main()
{
    Mat img = imread("C:/Users/Shyama Panolth/Pictures/Images/Hardeep Singh.jpg");
    imshow("MyWindow", img); 
    waitKey(0);
    return 0;
}

This works in VS2012 for me with the same error a simple warning. It is depricated code but you should still be able to use it.