When requesting support always include the installed XAMPP version and the Windows version you are using.
Go to http://localhost/xampp/phpinfo.php
in your browser and look for this line:
Loaded Configuration File
It will tell you the php.ini file being used and it's location.
Open the php.ini file in your text editor and find this line:
Uncomment it so it looks like this:
Save the file and restart Apache.
That should fix it.
BTW this is an English language forum, so no need to post in multiple languages.