Removing the Login window in Windows 200

Yes, I installed Windows 2000 Professional onto my computer. I went throught installation and when it came time to Network Identification and to select whether to always have to login or for Windows to always assumes the user has logged onto the computer. I selected that the user must always enter a user name and password. However, I have changed my mind and would like Windows to assume that I am always logging on. How do you go about changing it from one selection to the other, without having to reinstall Windows again.

Thank-you