How to disable Login or log on page on windows vista and windows 7

How to disable Login or log on page on windows vista and windows 7?

In the run menu type
control userpasswords2.

The user accounts windows will now open up.

Look for the option saying " Users must enter a user name and password to use this computer " and uncheck this option and press "OK".

Now a windows opens up asking you to enter the current password you use to log in to Windows 7. Enter the password and confirm. Done!.