how to put class.phpmailer.php in php.ini include_path

[mukeshrasm]

Hi! I want to use phpmailer class to send mail using smtp.I have downloaded the phpmailer and then i followed it's README file where it is mentioned that "Copy class.phpmailer .php into your php.ini include_path. If you are using the SMTP mailer then place class.smtp.php in your path as well", but I don't know where to paste the class.phpmailer .php into my php.ini include_path. In my php.ini file the include path is commented and it is like
;include_path = ".;c:\php\inclu des"

I am using WAMP Server. and it is in c drive.

please help me out