Beginner's question, so please bear with me.
I installed XAMPP under Windows XP, and PHP seems to work: when I click "phpinfo()" in http://localhost/xampp/ the complete list of settings is shown. However, when I check file:///C:/xampp/htdocs/index.php I get an error message saying "Something is wrong with the XAMPP installation :-(". Apparently the PHP code in this file is not being executed. Any ideas?