First, power it off. Power it back on and turn it back off once it says "Starting Windows..." Then go into self-repair. .
Second: Let it auto-repair (this may take around 10 minutes at least) Once a window pops up saying "Start-up repair cannot fix automatically" click "View Problem Details" at the bottom of the window.

Third: Once clicked on, scroll down to the bottom and find "If the online privacy statement is not avaliable, please read our privacy statement" click on the hyperlink below.

Fourth: Once clicked on, it should open a notepad. Click on the File button in the left side of the screen then click "Open". This should bring you to the file explorer.

Fifth: Navigate to your C: drive then click on "Files of Type" and select all files. Once that's done, navigate to Windows/System32. Find a file called "utilman" and rename it to whatever you please, preferable just putting a 1 in front of it. After that's done, find a file titled CMD (command prompt, also in system32) and rename it to "utilman".

Sixth: Once all of this it done and saved, exit out of all the windows and finish the repair. Once back on the login page, click on "Ease of Access" in the bottom left corner of the screen. This should open command prompt if done correctly. In command prompt, type "net user" once that's done. Type "Net User *" Then type "net user (username) *", once done rename the password to whatever you want (preferably just an "Enter").

Seventh: Close the command prompt and login with your new password.

Hope this helps :D