[Disable auto-login for Windows 7 with 1 user account without a passwor]

I don't what you means. Did you mean that you set a password and now want to disable it? If yes, it is so easy to fix this issue, I found this guide, it may help you, how to disable Windows 7 password

[how to remove password for domain user]

I suggest you can backup password before. This is a good way. Besides, you can reset Windows domain password with third party programs. I have used Windows Password Recovery Tool. Compared with other programs, this program supports domain account, you can find this on Google. At last, this is not ads. It is just advice.