PHP server error...

Okay, I am a total pussy and gave up on Linux to run my PHP server. I'm back to Win98, and everything is working fine except... For some reason, anytime I have a script that tries to set/access a session variable, I get this error.... Warning: open(/tmp\sess_slkfjsdkjfljfk, O_RDWR) failed: m (2) in c:\apache\htdocs\...\page.php on line xx (the sljfsldljksf is a big session number) then it says... Failed to write session data(files). Please verify that the current setting of session.save_path is correct (/tmp) in c:\apache\htdocs\...\page.php on line 0. I apologize if this is a apache or mysql problem. Anyone know what I'm doing wrong? Thanks!!!