how to configure sessions

Hi !!! I'm new in php, I just install php and apache, i test with info.php and all it's working. Now I'm trying to install a thirds party webapp and seams to have problems with sessions, I receive a warning error like "Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\Apache Group\Apache2\htdocs\webappphp\index.php:3) in C:\Program Files\Apache Group\Apache2\htdocs\webappphp\functions.php on line 26 Warning: Unknown: open(/C:/php/sessions/\sess_452f0a7e4f766da1ecc65a4eca8d9cb8, O_RDWR) failed: Invalid argument (22) in Unknown on line 0 Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (N;/C:/php/sessions/) in Unknown on line 0" In the php.ini I have session.save_path = "N;/C:/php/sessions/" Maybe somebody can help me! Regards Naty