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There exists a utility called 'WSUS Offline Update'. It was originally developed and published by the German pc magazine C'T, but recently it got its own web page :
www.wsusoffline.net
It allows you to collect OS and Office updates from the internet once, to be used later after Windows re-installation(s).
Even in case of the updates not having been brought up the most recent level, the installation of the majority of available updates will make the retrieval of the few remaining ones by Windows Update a much, much safer event.