Mag if you mean on the MS online update site, see if that one has the history available on the site like the 98 update version. Delete the service pack from the online history, dsiconnect from it and go back and you should be able to see the service pack again in the available updates/grades.
Might have to reboot your system but we never had to do that yet to get that method to work. We had some updates corrupt on installations and thats how we could get back to them again.
Hope the new ME-2000 versions still offer that way of getting around it. (We haven't upgraded yet from 98)