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.