Loading Extensions - HELP!!!

I am running PHP 4.0.5 (php4isapi.dll, not php.exe) on Windows NT 4.0 service pack 6a with IIS 4.0. I have installed manually using the zip file version that contains all the .dll extensions, and I have no problems using PHP itself. However, the problem comes when I want to use some of the extensions (namely LDAP). I am currently loading two extensions, php_ldap.dll and php_oci8.dll. The latter loads fine and I connect to Oracle with ease. But, when loading the LDAP version, I get the error Unable to load dynamic library 'c:\winnt\system32\php_ldap.dll' - the specified module could not be found at the server monitor and the error Fatal error: Call to undefined function: ldap_connect() in <file>.php on line <xx> at the browser (due to not loading php_ldap.dll). I have both running on an installation of PWS 4.0 with no problems. Can anyone please shed some light? Thanks, Neil Morgan Analyst Programmer Admin Computing University of Brighton nam14@bton.ac.uk Tel: (01273 64)3930