Problem:

For many of single-user computers, starting windows should be in a mode without log-in screen. For many reasons like fast speed, I don't want to see log-in screen when I turn on my laptop. What can I do for disable or bypass Windows Vista's logon?

Procedure:

1. Go to RUN
2. Type and Run: Control Userpasswords2
3. Then clear the "Users Must Enter A User Name And Password To Use This Computer" check box
4. And then in the next windows ("Automatically log on" windows), write the username that you want to start your computer on that panel
5. Finally, you can disable "Administrator" by right-click on it in the "Advanced" > "Manage Users".
6. That's all.

Link:

http://blogs.techrepublic.com.com/window-on-windows/?p=590