This article was previously published under Q196269
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After initial installation of a service pack for Windows NT, there aretimes the service pack may need to be reinstalled. This article describesthose scenarios.
The simple rule is this: Any operation that causes system files older thanthe service pack to be installed (for example, any time you are prompted toinstall files from the original Windows NT Server CD) should then befollowed by reinstalling the service pack.
This includes the following:
Adding any components that install files from the original Windows NT CD.
Performing an emergency repair operation that causes files to be restored that are older than the current service pack files.
Restoring from a tape backup that was created before the time the current service pack was installed
Installation of applications that may install older components.
If you have made any changes that replaced files with older versions aslisted above, when asked to restart the computer click "No" until you havereinstalled the service pack, applied any post service pack hotfixes, andapplied the latest SSD if on Compaq computer with the Compaq SSD loaded.This will keep the number of times you restart to a minimum and lessen thechance of a blue screen error message when restarting.
In the case of Small Business Server or Windows Terminal Server, theserules apply only for Service Pack 4 and later. Do not reapply Service Pack3 as it is slip-streamed into the initial build of Small Business Serverand Windows Terminal Server.
Service Pack updates also affect installations of Windows NT Option Pack. When Windows NT Option Pack, or components, are reinstalled, the latest service pack should also be reapplied.