How Can I Get Into a Locked Out Computer?

Rhonda is locked out of two different laptops running Windows 10 and Windows 8.1 respectively. She got back into Windows 10 after watching a few videos. Then she got locked back out after creating a new Outlook account. How can she get back in? There are a lot of legal documents and data she needs. Leo says that if she has a backup, then there are easier options. Rhonda says she did on the Windows 10 machine. 

This is why it's so crucial to have backups.