mapping Drive

On my win2k professional i have mapped my K: to D Drive of another Win2k Server on the network. while mapping it to K: on my system. i have selected the option “Reconnect on logon” . but whenever i restart the system it tries to reconnect to the mapped Drive but presents a password screen. i want it to take password automatically . meaning each time i restart my system it should show the mapped drive without asking the password to connect to the mapped drive. how do i get this ??