Re: Call to undefined function mcrypt_module_open() in PHP5 on Windows 2003

I fear you've really messed up your system by copying files all over
your computer but assuming this isn't the case this problem is really
simple. We've all been in your boat though and eventually "try
everything" but I can assure you this isn't the best way to solve this
problem ;-)

The fact that you have extension=php-cgi.exe and
extension=php5isapi.dll is a huge red flag as these uses of the
extension directive are very wrong. Either this php.ini is not being
loaded and/or you've not restarted the web server after making changes
to php.ini. Please look at phpinfo() and tell us exactly what the
"Configuration File (php.ini) Path line" says.

I don't think you've fully read the PHP Manual but maybe skimmed part
of it. Assuming you're using IIS (as per the attempt to use
php5isapi.dll), read this:
* http://php.net/manual/en/install.windows.iis.php
Regardless of web server, read the following very carefully:
* http://php.net/manual/en/install.windows.manual.php
* http://php.net/manual/en/install.windows.extensions.php

.