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Nick White, Windows Vista product manager, said on his blog, "We have heard a few reports about problems customers may be experiencing as a result of KB937287, the servicing stack update Immediately after receiving reports of this error, we made the decision to temporarily suspend automatic distribution of the update."
White said that this problem only affects a small number of customers in "unique circumstances" and the company is working on a solution.
KB937287, which is the servicing stack update, and KB938371, which is a multi-component update, are both required before installing Windows Vista SP1.
Both of the Windows Vista SP1 prerequisites are marked "Important" and will install automatically if you have Window Updates set to the recommended configuration.