chapter 3 AJAX test. I downloaded two example chapters from this site. Neither of them work on my computer, but both do work at the site I downloaded them from. As far as I can test, XAMPP is installed, configured and running properly. I installed XAMPP 2 years ago. Today I tested it with helloWorld PHP code and it seems to work. I am running Windows XP SP3. Why won't AJAX work? Any help thanks.