Hi orange and welcome to the forum
This is an indicator that you did something wrong with your W10 install. Did your computer come with W10 pre-loaded from the factory or did you upgrade the computer from an earlier version of Windows? If so, which version of Windows? Also, it would be helpful to know the Make/Model of the computer giving you this problem. Is it a desktop PC or a laptop? Is it an OEM PC (Dell, HP, Acer, Gateway, Toshiba, etc.)? Or is it a self-built rig or a custom-rig?
This information would help us to determine how to best help you.
Generally, speaking, prior to having you start any troubleshooting procedures, ensure first that any personal data such as documents, photos, music, movies, E-mail, etc. is backed up to external media.
Once you have all your stuff backed up from that computer, you should then reinstall your W10 from factory Recovery Media (DVD or USB). Unless you upgraded your computer from much older hardware (built prior to 2009) to W10, you can do this directly. Otherwise you'll need to run hardware diagnostics to test your RAM memory sticks and Hard Drive. After we know the answers to the questions I asked above, if needed post back here and we'll provide you links to the Hardware diagnostics.
So, you know, when you type in the wrong password in W10 while attempting to login into a Microsoft account this is the error message you should be receiving:
"That password is incorrect. Make sure you're using the password for your Microsoft account. You can always reset it at account.live.com/password/reset."
Best,
<<<BIGBEARJEDI>>>