PHP mail function not working

I tried using the php mail function and it does not send any email. In my php.ini file in C:\Program Files\PHP I set SMTP to my ISP's smtp email server and port is set to 25. However, when I run phpinfo, it shows SMTP as localhost and port 25. I'm not sure why when I run phpinfo, it still says SMTP is set to localhost? How can it say this when I changed the php.ini file? Is there more than one php.ini file that I need to modify?

 

yes there's 2, in php folder the other under apache folder. do a search.

 

I'm not using Apache but IIS 7 with Windows Vista.