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Do you mean that the computer boots to the desktop instead of start screen? If yes you can refer to the tips on this page: http://www.lostwindowspassword.com/windows-8-1/how-to-boot-to-desktop-mo...
In essence, the new Windows 8 lock/login screen is meant to act as a dashboard, flashing up notifications for new email, IMs, and so on. On a tablet, where you swipe the lock screen away and then begin typing, this makes perfect sense. On a desktop PC, though, the lock screen is clunky (you might say this is a bit of a recurring theme in Windows 8). Yes, theoretically you only have to tap a key and it slides away, but for some reason Microsoft introduced a delay so that you can’t immediately type your password. As a result, you often end up losing the first few letters of your password, waiting for Windows to tell you that your password is incorrect, and then typing your password in correctly.
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You can change a setting so you don't have to put the password in every time you start up. Hold down the windows key and press r, type in netplwiz, OK, then uncheck "users must login with username and password" , apply, enter password (twice), OK, shutdown computer, then restart it.