Windows XP / 2000 implements automatic login: whether or not the computer has been plus a domain, it can be implemented by changing the registry. Create several key values under the registry hkey_local_machine / software / microsoft / windows nt / current version / Winlogon. Create a double-byte (REG_DWORD) value AutoAdminLogon. The value is 1 indicates that the automatic login function is enabled, the value is 0 or the value item does not indicate that the automatic login function is not used. Modify the value of the string value DefaultDomainName is the default domain name (this name or localhost). If the machine is not in the domain, the value of this value is the name of the computer. Modify the value of the string value defaultUserName is the default username. Modify the value of the string value DefaultPassword is the default password. If the password is empty, you can delete the item. If not, you can add it. After restarting, the new settings will take effect. (In addition, some people say that when installing the Windows 2000 operating system, you can choose to automatically log in. This will automatically log in when you install it without setting it. I can't affirmed this.)
Systems that are not joined domains a simpler method: Windows XP / 2000 requires the account to select an account and enter a password, for the utility, which is of course safer, but if this computer is a person to use each time It is too much trouble to choose an account and enter your password. How can I make Windows XP automatically log in without entering passwords?
Click Start / Run, enter "Rundll32 Netplwiz.dll, UserSrundll", then press Enter to pop up "User Account" window, cancel the Selection "To use this machine, users must enter the username and password" option, click OK, enter the account and password you want to log in automatically each automatically log in to the computer in the dialog box pop-up.
Below is a part of the Windows Help documentation, from this document you can see that the above method is not feasible for your computer to join the domain.
In the Working Group Settings or Disable Login Password: Open User and Password on the Control Panel On the User tab, do one of the following: Click the user must enter the username and password to use this Computer check box, this information must be provided when the user is logged in. Clear "Users must enter usernames and passwords to use this Computer" check box to allow users to be automatically logged in. The system will prompt you to enter the username and password of the user who automatically logged in each computer startup. Note: When your computer is not connected to the network domain, the "user must enter the username and password to use this computer" checkbox will appear. You must log in as a member of the Administrator or Administrators group to use the "User and Password". If only one person uses a computer or the security is low, it will be convenient to automatically log in to Windows 2000 each time you start.