mssql extension not loading iis6

["wayne" <watkinson@xxxxxxxxxx>]

I am confused with the following problem:
If I run "php -m " from the command prompt I see the mssql module is listed 
as loaded. However from the webpage running phpinfo() it will not show as 
loaded and will not run any dbconnect code.
I have gone over numerous howtos and seeing how I have another server that 
is working and from which I copied everything, I am at a loss to explain it.

details: Windows 2003 server IIS6 ISAPI mode; ini file is being read 
properly; I can add and remove other dlls so the perms are correct.
I have downloaded the lastes versions as well as trying 5.1.6
I have gone through the following as well:
http://www.peterguy.com/php/install_iis6.html

Has anyone ever run into this before?