It is very disappointing that you find Windows 10 cant login.

This post offered byMiniTool Solutionhas provided multiple useful methods for you to fix it.

Windows 10 cant sign into account?

choose Sign in with a local account instead

And these methods also apply to this problem that appears after upgrading to Windows 10.

Method 1: cycle your system

The first step you should take is to cycle your system.

In most cases, restarting your rig will solve many problems.

So you just need to click theStartbutton, then choosePowerandRestart.

Here Are Ways to Solve Them.

And if there is no problem with the Internet connection, then you should try the following methods.

Here is a quick guide on how to use the Local Account:

Step 1: OpenSettingsand then selectAccounts.

Step 2: Go to theYour infotab and then clickSign in with a local account instead.

Step 3: key in your password and click Next.

Then enter a username for your local account and click Next.

If there are several accounts on the computer, then choose the right one to reset.

Step 2: ChooseI forgot my password.

throw in the characters showed in the box belowEnter the Characters you see, and then clickNext.

Step 4: Enter the code that you have received and then chooseNext.

Step 5: On theReset your passwordscreen, create a new password, and then chooseNext.

Then clickNextagain to return to the sign-in screen.

Now you might sign in with your new Microsoft account password.

(This link will appear after entering the wrong password.)

Then enter the answer to the security question and choose a new password.

Hope they are helpful to you.