Error with Sessions please help

I have been using PHP4.04 on W2K with little or no problems using php.exe instead of isapi. But when I try to initiate a session with <?php session_start(); ?> I get: Warning: open(/tmp\sess_0baf96e5228010461d9116db56bb349b, O_RDWR) failed: m (2) in c:\inetpub\wwwroot\DBTest.php on line 2 Successfully connected to MySQL Successfully selected "Portal" There are currently 2 users in the database. User Name User Type Last Login City Robert Trembath Shopper 6/30/2000 1:37:40 PM Houston Robert Trembath Realtor 6/30/2000 9:11:20 AM Houston Warning: open(/tmp\sess_0baf96e5228010461d9116db56bb349b, O_RDWR) failed: m (2) in Unknown on line 0 Warning: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0 Thanks, Robert