Hi Noreen Garcia,
Just checking in to see how you’re getting on with this. Have you had a chance to try the steps in the AI Answer above? If so, please let me know which steps you tried and what happened, so I don’t suggest anything you’ve already done.
Would you also mind sharing the exact message you see when you try to sign in? Also, are you signing in with a personal Microsoft account, a local Windows account or a work/school account? If you remember, did this start after an update or another recent change to the PC?
If another account is shown on the sign-in screen, it would be helpful to see whether you can sign in with that one. I’d also double-check the keyboard language, Caps Lock and Num Lock or try the on-screen keyboard from the Accessibility menu just to rule out an input issue.
If the problem started after a recent system change and nothing suggested so far has helped, System Restore may also be worth trying if you have a restore point from before the issue began.
Let me know what you find, especially the exact error message. That should help narrow down what’s going wrong and what would be best to try next.