Hello Arunkumar, I'm Johrelle a fellow Windows/Microsoft user. I'm happy to assist you.
You can try looking for an "Ease of Access" icon on the login screen (usually a person icon). Click on it and try using the on-screen keyboard to enter your password.
Make sure that the Sticky Keys/Filter Keys are not accidentally turned on, as they can alter keyboard behavior. Also, ensure that the Num Lock key is not activated, it can also interfere with password entry.
If possible, try connecting an external keyboard and check if it works.