Using this method to configuring Auto Logon stores the password in clear text, allowing anyone with access to the registry (either locally or remotely) to see the password. There are tools that do this and can store the password securely.
To configure auto logon, follow these steps:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WinlogonDefaultDomainName and enter the domain name to use.DefaultUserName and enter the user name to use.DefaultPassword and enter the password to use.AutoAdminLogon and enter a value of 1.