XAMPP installation

[Addix]

After successfully installing XAMPP, and after setting mysql and phpmyadmin passwords, I tried to open the index.php file in the htdocs folder with Firefox. The Control panel was green for both Apache and Mysql. This is the message i got:

Something is wrong with the XAMPP installation

What should i do? Without solving this challenge, previewing PHP webpages by Apache would be impossible.

Please help

Addix

[Altrea]

HOW did you open index.php?
What does your browsers address bar show at the moment you get this message?