Loading php_domxml.dll

I am using PHP 4.3.4 with Windows XP and Apache 2. I can't get php_domxml.dll loaded. I have searched for answers and tried many things. The file: S:\Software\php-4.3.4-Win32\extensions\php_domxml.dll exists. In my php.ini, I have tried setting extension_dir to many values, including: extension_dir = "S:\Software\php-4.3.4-Win32\extensions" When I restart Apache I always get a "Unable to load" (message box) message that says: Unknown(): Unable to load dynamic library 'S:\Software\php-4.3.4-Win32\extensions\php_domxml.dll' - The specified module could not be found. Of course, the path that is shown is whatever I have set extension_dir to. When the php script gets to the line that I use DomDocument, it says it "Cannot instantiate non-existent class: domdocument". When I execute php from the command line, I get a (message box) message saying that iconv.dll cannot be loaded, then the "Unable to load" message, such as the following: S:\Software\php-4.3.4-Win32>php -v PHP Warning: Unknown(): Unable to load dynamic library 'S:\Software\php-4.3.4-Win32\extensions\php_domxml.dll' - The specified module could not be found. in Unknown on line 0 PHP 4.3.4 (cgi-fcgi) (built: Nov 2 2003 23:47:22) Copyright (c) 1997-2003 The PHP Group Zend Engine v1.3.0, Copyright (c) 1998-2003 Zend Technologies