1. Launch either of the Registry editing tools (Regedit or Regedit32) in the Winnt folder.
2. Locate HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WinLogon.
3. Within this subtree, edit or add the following keys:
DefaultUsername (your username).
DefaultPassword (your password).
DefaultDomainName (your domain).
AutoAdminLogon (set to 1 to automate the logon).
4. Close Regedit, and reboot.