Stoopid Question - PHP.ini path?

Hi.. Sorry to ask such a stoopid question here... but I really could not find anything on this... How do I change the path of the php.ini file on Windows XP pro? I'm using IIS... I just installed PHP on my web server and the path of the php.ini is c:\winnt but my is on c:\WINDOWS . So, how do I do this? I tried searching over the web.... most of them talk about configuration.. I can't seemed to find anything on changing the path of the PHP.ini file. THank you so much in advance. Yours, Wee Keat