The built-in administrator account has not been renamed.

From Windows Vista Security Technical Implementation Guide

Part of Rename Built-in Administrator Account

Associated with IA controls: IAAC-1

SV-28997r1_rule The built-in administrator account has not been renamed.

Vulnerability discussion

The built-in administrator account is a well known account. Renaming the account to an unidentified name improves the protection of this account and the system.

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Configure the system to rename the built-in administrator account.

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