Windows 10: Cannot login to my computer because it says wrong password

I have an issue with my windows computer. I have entered my password which always worked and suddenly one day, it said the password was wrong so I turned off my PC for a moment because sometimes the same problem happend and it came back to normal but this time it wasn't working. I even restarted my computer and tried to change my password but it showed the new password I tried to make was wrong. I Don't know why it's like this but I really need some help how to login back or what's the issue here lease help

:)

 

Password issue

After going through the steps to make a new password, after a week or two, my login credentials are no longer valid. I'm forced to make a new password all over again. It seems to happen if I don't login in a certain period of time. Does our passwords expire???

 

No login password craziness

Brink, that was the missing step. What threw me off was in netplwiz, where it asks about password for my MS account, the user name was not the same as my MS account name. Once I entered the password (twice) I can now login without entering a password. In fact the name that was listed was not the MS account name, but a folder name. The folder is the one that shows when you click on C:\Users.
Thanks for the help.

 

PC Bloked for wrong password.

Step1: The PC has already been disconnected from the Internet.

Setps 2-3: I did not understand
why use the keyboard on the screen,
however, now I have tried in this way.
Before giving Enter, I also check
that the password has been entered correctly.

The user does not know other passwords
and he says he has always used this.