I don't run any language packs, but it looks from my research, the problem might be related to a language situation. Maybe someone else will know, but if you are running another language, are there special procedures for doing certain updates?
Do you happen to know which update caused the problem? I think my system had 11 updates with one important and one optional update not checked. So I just installed the original 11. Then I installed the one important update, which happened very fast, and then the optional update, which took a little more time and did require a restart.