I ran phpinfo and it said it was in C:\Windows but it's not there. It's not in the php folder. I did a system search and it wasn't found.
Where is it hiding?
Run this code (and I am assuming your php is running, you are not able to just locate the php.ini file)
<?php phpinfo(); ?> And check the location of the config file:

wamp\bin\php\php5.3.9in xamp\xampp\php\php.iniC:\Program Files\PHP. If it is not there why not use explorer to search for it (and then make a note for future reference)<?php phpinfo();