session_start() can't write any directory in windows xp

After reinstalling PHP 4.3.4 I have not been able to work sessions. Receipt Warning: session_start (): open(/tmp\sess_... etc. I have modified the session.save_path in php.ini and I have created the directories manually in the work directory in the root and in the root directory of the web server that is xitami. Also, I have tried to install php in the root and in the programs directory. I always obtain the same result and it seemed that the configuration of the ini doesn't have anything to do with the form like php is executed. phpinfo () it always reports / tmp for session.save_path Is there somebody that can help me? If Spanish or Portuguese speak better. Thank you.