Operating systems such as Windows 7 allow you to secure your computer with a password. You must enter this password, along with your username, into a log-in screen each time you boot-up your computer or when a session expires. If you do not want password-protection for your computer, you can configure Windows 7 to boot without asking for a username and password.
Click "Start," then type "netplwiz" (without quotes) and press "Enter."
Click the tab labeled "Users."
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Clear the box next to the option labeled "Users must enter a user name/password."
Click "Apply" to start Windows 7 without a username and password.