The error is pretty self explanatory.  You need to enable the LDAP extension in PHP.For windows systems you need to make sure that you have the extension.  It should be in your PHP5/ext folder.  If its not there you will need to get the version that corresponds with the version you have installed from PHP.net.   And then go into your php.ini and add or uncomment this:extension=php_ldap.dllAs a side note, this has been covered on the forums multiple times, and search is your friend. :)

Did you restart your web server software after making the php change?If you are still seeing this error after restarting Apache then its likely that your path to the extensions in the php.ini isn't correct because the only time that you error happens is if PHP cannot find the extension or it isn't loaded.  Also check to make sure that you do not have multiple php.ini files, Windows users often do.Regardless this is a server configuration issue, not an osTicket one.

You have not supplied enough information about your setup for me to answer that question. I do not run WAMP server, so I have no idea where it wants the extensions. I install and configure PHP, Apache, etc and configure it myself instead of relying on third parties to push them together and configure them the way they think is best.  You would need to consult your php.ini to find out what folder is used for extensions, and make sure that the extension is located inside said folder.  Failing that you would want to consult with the publishers of WAMP server for further support.