Auto Login

Is there any way to have Win2K Prof. or NT logon to the network automaticaly with out having all machines autologon with a user account of Administrator. (Our network is all workstations) What I would like is for all machines to autologon with a user and default password. Then if I need to work with the machine log off as a user and logon as administrator. But if I set the AutoAdminLogin as a user then I can not get back to administrator util I hack the regiestery from a remote machine.
I am in a production facility and have about 40 computers on the network.