I am running win2003 std. with plesk 7.5.3. The problem I am having is a customer needs to install the zend optimizer which is neccessary for a few php programs they run. What happens is the install seems to go fine and the phpinfo page show the correct information, but when the plesk backup software runs and makes a backup once the services are restarted I lose access to the login page. The accept security certificate comes up and I ok that but when the username and password box tries to come up I get a page can not be displayed error. The zend optimizer version I am trying to install is 2.5.10. If anyone has successfully installed this program or has any tips I would appreciate any input.