A tip for users that now use the latest version of Windows 7 Ultimate, Apache 2.2.22 and PHP 5.4.4. If you manually installed PHP and did not change the PHP folder name such as "C:\php-5.4.4-Win32-VC9-x86" you don't need to add the curl libs into the System32 directory. Instead, modify the php.ini cURL extension to point directly to the php_curl.dll as follows:
I added the libs to system32 and moded the path as well just in case. Worked well for me.