php5.3无法加载zend guard 5.5


php.ini写入配置语句，还是不行，怎么回事
[Zend.loader]
zend_loader.enable=1
zend_loader.disable_licensing=1
zend_loader.obfuscation_level_support=3
zend_loader.license_path=
zend_extension=”e:/php/php5/ext/ZendLoader.dll”