Do you have the lib and config folders below your /bin folder? If not, try that. Also check whether you have a valid cd_licenses.xml in your config folder.

Do you have the lib and config folders below your /bin folder? If not, try that. Also check whether you have a valid cd_licenses.xml and cd_storage_conf.xml in your config folder.

Additionally, check the Event Log to see where Tridion Content Delivery is loading its jars from. If that does not help, check whether the TRIDION_HOME variable is set on your server. This might point to a wrong directory.