Enable Auto-Logon in Windows Vista

1. Click Start and type 'netplwiz'.
2. In the GUI window that comes up, uncheck the "Users must enter a username and password to use this computer" checkbox.
3. Click 'Apply'.
4. In the new dialog box that opens type the name of the account you want to auto-logon by default (if the account is not normally passworded then leave it blank)
5. Click OK and exit