I have just installed the leopard last night. while i clicked into the mac HD, i see there is another person's name appeared under the folder SHARE. It is a pc user and has been somehow connected to my computer under a guest connection. I am really worried that he might have hacked into my account and steal my personal details. Or stealing my internet, I already have a wep pin for security. can someone please help and let me know how to stop the connection or forbid other random people logging into my computer? as that person might not even realise that we are connected. Thank you so much!