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Open Run and type netplwiz
Open Control Panel > Administrative Tools > Computer Management
Set the following keys in [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
"AutoAdminLogon"="1" "DefaultUserName"="myname" "DefaultPassword"="mypwd" "DefaultDomainName"="mydomain"
The domain name entry is not needed for a private LAN with workgroup, but if you set it, set it to the name of your machine (computer) all in caps letters.
net user Administrator /active:yes
net user Administrator /active:no