Having a password on a machine is recommended if your computer may be around people you don’t want accessing your data. Environments such as a small or home office you may be trusting enough to go without requiring a password. If you want to enable or disable the prompt to type a username and password to get into Windows you can follow these steps.
1. Click Start and select Run.
2. Type control userpasswords2
3. Select the user you would like to use every time you login.
4. Uncheck or the box that says Users must enter a user name and password to use this computer to disable password screen and allow Windows to automatically login and bring users to the main screen. Check the box to enable username and password protection.