long - but should work when netplwiz does not.
In Registry Editor, navigate to the location below.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
You could also use this step to change what user account you would like Windows to automatically sign-in to at startup
A) In the right pane on Winlogon, double click/tap on the AutoAdminLogon string value to modify it.
B. Type 1, and click/tap on OK.
C) Double click/tap on the DefaultDomainName string value to modify it.
D) Type the computer name (if local) or domain name, and click/tap on OK.
E) Double click/tap on the DefaultUserName string value to modify it.
F) Type the user name (ex: Snuffy) of the account you want to automatically be signed in to at startup, and click/tap on OK.
NOTE: This will be the same name as the user account's C:\Users\(UserName) profile folder.
To use Registry Editor to turn on automatic logon, follow these steps:
Click Start, and then click Run.
In the Open box, type Regedt32.exe, and then press Enter.
Locate the following subkey in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Double-click the DefaultUserName entry, type your user name, and then click OK.
Double-click the DefaultPassword entry, type your password, and then click OK.
Note If the DefaultPassword value does not exist, it must be added. To add the value, follow these steps:
On the Edit menu, click New, and then point to String Value.
Type DefaultPassword, and then press Enter.
Double-click DefaultPassword.
In the Edit String dialog, type your password and then click OK.
Note If no DefaultPassword string is specified, Windows automatically changes the value of the AutoAdminLogon key from 1 (true) to 0 (false), disabling the AutoAdminLogon feature.
On the Edit menu, click New, and then point to String Value.
Type AutoAdminLogon, and then press Enter.
Double-click AutoAdminLogon.
In the Edit String dialog box, type 1 and then click OK.
If you have joined the computer to a domain, you should add the DefaultDomain value, and the data for the value should be set as the fully qualified domain name (FQDN) of the domain.
Exit Registry Editor.
Click Start, click Shutdown, and then type a reason in the Comment text box.
Click OK to turn off your computer.
Restart your computer. You can now log on automatically.