Why does Windows ask twice for password?

For glarification, I mean the power-on password. When I start my computer, this screen shows up, then I type my password and press enter, then it shows the startup screen, then the screen shuts down for a second and then it puts me back on this screen again. How can I get rid of this whole thing? I don't need it to ask for password three times since there is also the user password I have to type in.

"Can I sign in to Windows without a password?"

http://windows.microsoft.com/en-us/windows-8/disable-remove-password

  To switch from a Microsoft account to a local account

1. Swipe in from the right edge of the screen, tap Settings, and then tap Change PC settings.
   (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, click Settings, and then click Change PC settings.)
2. Tap or click Accounts, and then tap or click Your account.
3. Tap or click Disconnect, and then follow the instructions.

To remove an existing password from a local account

If you're using a local account with a password, you can delete the password to sign in without one, but we don't recommend it.

1. Swipe in from the right edge of the screen, and then tap Search.
   (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Search.)
2. Enter sign, and then tap or click Sign-in options.
3. Under Password, tap or click Change.
4. Verify the current password for your local account.
5. Leave the New password, Reenter password, and Password hint fields blank, tap or click Next, and then tap or click Finish.

Now, you (or anyone) can sign in to your local account and use your PC without a password.