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Operating steps:
First, directly use the Win+R key to call up the run dialog box, and then enter the Regedit command in the run window to open the registry editor.
Secondly, on the registry, expand the current version of HKEY _ Local _ Processing \ Software \ Microsoft \ Windows NT \, then create a new Winlogon key on the current version key, and then create a SpecialAccounts key on the Winlogon key. Create a user list item on the SpecialAccounts item in the same way.
Third, finally, in the right pane of the UserList item, create a new DWORD32-bit value, change the key name to administrator, rename it to 0, and then log off the Win7 system.