If you are using Windows and don't want to enter username and password each time you start Windows, then this tutorial will help you.
1. Type control userpasswords2 in RUN or Startmenu Search box (Vista) and press Enter.
2. It'll open "User Accounts" window.

3. Now disable "Users must enter a user name and password to use this computer" option and click on Apply button. It'll ask for the username and password which you want to use for auto-login. Enter the details and click OK.
4. Thats it. Now Windows will automatically login the selected user and will not ask for password.
PS: If you want to reverse it and want Windows to prompt for username and password, then simple enable the option mentioned in 3rd step.
This article was posted by VG in following section: Troubleshooting, Windows 7, Windows Vista, Windows XP.
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fitiamj
well it's very easy te logon to windows 8 without typing anything , all u have to do is , when u install windows 8 , when it asks for username and password give just username dont give password , thats all u have to do , i do this in all windows and it works just fine .