Can't Load The Php Sqlsrv.dll For Some Reason

Running MS2k3 webserver with IIS and PHP 5.2.5

my php.ini is in the Windows folder containing among other things these 2 entries:

extension_dir ="C:PHPext"
extension=php_sqlsrv.dll

and the file php.sqlsrv.dll is located in the PHPext directory

I've restarted the IIS server with php running and working just fine. Is there anything else I could still check ?





Code Snippet

if (!extension_loaded('sqlsrv')) {
echo("NOT LOADED");
}

Produces: not loaded.


EDIT:
Dug up some logs:
The description for Event ID ( 2 ) in Source ( PHP-5.2.5 ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: php[2144]; PHP Warning: PHP Startup: Unable to load dynamic library 'C:PHPextphp_sqlsrv.dll' - The specified module could not be found.
in Unknown on line 0.