Method one: Login with the default administrator account
Step 1: Start Windows PC
Step 2: When you can see the Windows login screen, press ctrl+alt+del keys Twice and it'll show Classic Login box
Step 3: Type Administrator as Username and leave the Password field blank
Step 4: Press the Enter Key and then you can be able to login the default windows administrator account which is it created by default when install windows.
Note: When you input the key combination Please dont put the cursor on any account. And if you change the name or password before, you cannot login by this way.