no configuration files

[antoniofranco81]

Hello to everyone. My problem is: (I hope you may help)

when I write this url: http://localhost/
it give me back a blank page, and only one information:

No configuration file found and no installation code available. Exiting...

this problem is started when I modified the "php.ini" file (xammp/php was the folder), in order to allow the use of the curl extension (I had just deleted ";" on the same line); the server is running: Joomla is working, the only problem is: I see no longer the Xampp panel. What's happened?

Thank you for attention (and eventually help)