"I think the way you installed LDAP is the problem. Can you do the following please:
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Delete php5ts.dll and php_ldap.dll
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Go to Control Panel--->Add/Remove (Uninstall) Program
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Click on PHP 5.2.11 install and say 'Change'
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Click on 'Change; in the install UI
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Check IIS FastCGI radio button
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From the extensions list choose 'LDAP' and hit 'Next'.
This should setup LDAP for you.
Thanks,
Don."