I have theese errors posting on the top of my website. I was wondering if anyone knows how to fix them?

Warning: session_save_path() [function.session-save-path]: Unable to access D:/ZenCartDog/cache in /home/pureroma/public_html/includes/functions/sessions.php on line 145

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/pureroma/public_html/includes/functions/sessions.php:145) in /home/pureroma/public_html/includes/functions/sessions.php on line 102

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/pureroma/public_html/includes/functions/sessions.php:145) in /home/pureroma/public_html/includes/functions/sessions.php on line 102

Warning: Cannot modify header information - headers already sent by (output started at /home/pureroma/public_html/includes/functions/sessions.php:145) in /home/pureroma/public_html/includes/init_includes/init_templates.php on line 78

please help not sure what to do here