Restore Adminstrator's ownership

I did it. My mistake. Long story short I removed permission from the Administrator to administrate. I cannot access the security center, upgrade, change, restore, or take ownership. I just rehabbed this old ThinkCentre m 8122. No conflicts, all was great til my screw-up. Please help.

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More about restore adminstrator ownership
  1. log in to the hidden Admin account that Windows Setup creates by default, then change permissions for your own user account.
    When done, restart normally:
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