Eclipse unresolved inclusion for includes

Hello,

I am just learning programming in C++ and I wanted to make them on Eclipse as the UI is great and has some helpful stuff there but I can not get it to work as I have this "Unresolved inclusion" error at every include that I put in. Even an auto-generated file has this problem (as I started a "Hello World" project from Eclipse and the code is there auto-generated and still does not work).

I'll be very grateful if you will help me.