Windows Autologon
* Windows registry:
- Launch Regedit
 - Navigate to:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\winlogon
Set: AutoAdminLogon = 1 (one means on, zero means off.) - DefaultUserName. The value should reflect the user who you wish to logon automatically. If this value does not exist, then right-click in the right pane, New, REG_SZ, name it, DefaultUserName. Set the string value to the required UserName
 - DefaultPassword. The password of the previous user (If this value does not exist, then right-click in the right pane, New, REG_SZ, name it, DefaultUserPassword).
 - Finally, if it's a domain user, create a String Value called DefaultDomainName.  
Set: DefaultDomainName = "OnlyYouKnowDomain" 
* External application:
This application do the same as "windows registry mode" but in a pretty view.

- Enter user name.
 - Write user's password.
 - Enter the domain
 - Click on "Enable"
 - Reboot the machine and check autologon.