php installed on IIS: changes to php.ini not taking affect

I have php 5.2 up and running on IIS 5.1. phpinfo tells me php is looking for my ini file in C:\Windows...I place the file there, edit it, restart the server but I don't see the changes I've made. I've been dealing with this for a day and can't seem to find any information as to what's causing this problem. I've tried adding C:\PHP to my system path where C:\PHP is where php lives. I also have PHPRC pointing ot C:\PHP...not sure if either of those would have anything to do with my problem. Does anyone have any ideas?