getting domxml working under Windows

Hi,

I need help getting domXml to work under windows.  The instuctions are 
confusing.

I have PHP 5.0.0.  configured with Apache server preconfigured in 
UniServer3.2

I copied php_domxml.dll to the php/extentions/ folder
I modified php.ini so that
  extension=php_domxml.dll

For versions before 5, the PHP docs say either libxml2.dll. or iconv.dll 
need to be in the system folder or in the system path, but it say:
"And as of PHP 5.0.0, iconv is compiled into your Windows PHP binaries by 
default so no extra DLL is needed."

When I stop and restart Apache server, I get 2 error messages:
"The procedure entry point ap_php_vsnprintf could not be located in the 
dynamic link library php5ts.dll"
and then
"PHP Startup: Unable to load dynamic library 
'/usr/local/PHP/extensions\php_domxml.dll' - The specified procedure could 
not be found."

The extension is in the correct directory as well as other extensions that 
are loading (php_mysql.dll, for example).

I also downloaded the GNOME Xml library, but I don't know how to install it. 
I tried putting libxml2.dll from there into the windows/system/system32 
folder, and other places, but still get the same errors.

please help!

Chris