My computer is on a workgroup
In the Search box, type control userpasswords2, and then press ENTER. Administrator permission required If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Clear the Users must enter a user name and password to use this computer check box, and then click Apply.
In the Automatically Log On dialog box, type your password, and then click OK.
In the User Accounts dialog box, click OK.
After you restart your computer, you will be able to log on automatically.