Trouble with my session variables

Hi there. I´m Matias from Argentina. Here´s my problem. I´m using latest php ver. under Win ME, w/ Apache I can correctly start my sessions, register my variables, access them from another script than the one they are registered BUT when i "unregister" a variable or "destroy" a session an error message apears. It says that my path to php sessions is probably incorrect. But when i start the session for the first time it is well created in the right directory. I would apreciate a lot if anyone could help me out. Thanx. Matías P. Pereyra