Enable OpenSSL Support for PHP on Windows 

As a prerequisite, two libraries must be existing in your Windows system: libeay32.dll and ssleay32.dll. Two ways to achieve this:

• Install OpenSSL for Windows
• Or, copy these two files to C:\WINDOWS\system32 folder. They’re shipped with PHP package, you can find them in PHP root folder.

OK, it’s time to open php.ini by using any text editor, and remove the semicolon before the following line:

extension=php_openssl.dll

Done!
http://huang.yunsong.net/2009/windows-php-openssl.html