Check that your port 80 is not blocked by Skype or some other program if you still cannot get things to work. You can see which programs are blocking port 80 on your system by going to Windows Start button > apachefriends > xampp > port checking

Furthermore, I notice that you are using a XAMPP version that is newer than the one recommended in the book.

As such, you might have to make some port changes to your XAMPP installation for things to work properly.

You can do a search in the forums to see what are the solutions.