Hello
Thank you for posting in Q&A forum.
You can try to open "local users and groups", click Groups and find local Administrators, please check if there is any member in local Administrators.
If so, you can sign in one account in this Administrators group.
If there is no any account in this Administrators group, you need to add one local user account to this Administrators group. Please check if your machine is in work group or in one domain. If your machine is in domain (such as below), you can ask your domain admin to help you add one account to local Administrators group.
I hope the information above is helpful.
If you have any questions or concerns, please feel free to let us know.
Best Regards,
Daisy Zhou
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