You may need to edit the php.ini file at some stage.
In that same folder can you see pear.ini ?
No need to install again but download the zip or 7zip version and drag the php.ini file from the archive into the C:\xampp\php folder.
You will know for sure then that the file is present.
If it asks to overwrite the file then you will also know that the original php.ini file is also present but a setting in Windows is still hiding it.