The "Administrator" account is present in all versions of Windows based on NT but starting with Windows XP it is disabled by default. Additionally, in Windows 7, Windows 8 and Vista, even when you create a new admin-level account, it still requires UAC elevation. The default account named "Administrator" remains disabled and hidden. If you boot Windows into Safe Mode then it is enabled. However, you can unhide and enable the Administrator account if you want.
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