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You cannot install Windows NT 4.0 Routing and Remote Access Service (RRAS) with the unattended setup process on a computer that already has Windows NT 4.0 Service Pack 4 (or earlier) installed.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
152734how to obtain the latest windows nt 4.0 service pack
For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: