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NTRootKit appears to be a hacker tool that once installed in your computer can gain admin access and perform various functions.
What is NTRootKit?
From McAfee and Network Associates:
“The NTRootKit is a hacker tool, used after an attacker has gained admin
access to a Windows NT/2K system. Once the NTRootKit has been installed, an
attacker can perform various functions…” Read
their article. Yet another reason to scan for viruses regularly.