I cannot install PHP-CURL on IIS. I think I have tried everything.

My phpinfo() output does not list cURL as available.
I have C:\PHP in my path and working correctly.
I have edited the registry to read from C:\PHP\php.ini. phpinfo() output shows the correct .ini path loaded.
I have uncommented 'extension=php\_curl.dll'
I have ssleay32.dll and libeay32.dll availble in C:\PHP

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* Windows Server 2003
* IIS 6
* PHP 5.2.4