Step 1: Instal Eagle
The program has to be installed so that clicking on the start button will bring up a menu somewhat like the one below. Clicking on the icon labelled EAGLE 4.13 will start the program. If you have a different version, those digits might be different, of course.
I am sorry, I do not remember any details of installing it. Selecting the default choices offered during installation should be fine, because that is what I usually do.