Solve error - opencv2/highgui.hpp: No such file or directory.

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I am a beginner of OpenCV. I just downloaded it for my Windows and extracted.

I have read this post: http://opencv-srf.blogspot.ro/2011/09... about how to read webcam and I copied and pasted the code in a C++ file created in "include" folder of OpenCV extracted archive to be able to include the file in header.

When I try to run the program I get this error: /opencv/build/include/opencv2/highgui/highgui.hpp opencv2/highgui.hpp: No such file or directory.

What should I do?

Thank you all!