Hi Laura. I'm Greg, an installation specialist and 9 year Windows MVP, here to help you.
How about trying to change the password?
https://support.microsoft.com/en-us/help/402697...
If not possible then user Microsoft Account Recovery to reset password:
https://support.microsoft.com/te-in/help/17875/...
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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