After users starting having problems with a Windows Vista update, KB937287, that is a prerequisite for service pack 1, Microsoft pulled the update from automatic distribution until they discovered what the problem is. All they have stated so far is that it has only affected a small number of users in certain unique circumstances, no cause for the problems have been given yet.
So far, we’ve been able to determine that this problem only affects a small number of customers in unique circumstances. We are working to identify possible solutions and will make the update available again shortly after we address the issue.
Customers who may be experiencing this issue can use system restore to correct it or contact 1-866-PC-Safety for help troubleshooting. Additional guidance will be available via Microsoft’s free Update Support Center soon. Source: Update on Windows Vista SP1 Prerequisite KB937287
Mary Jo has this to add:
Last week wasn’t the first time endless reboot problems were reported by Vista users. In fact, there were reports of endless-reboot-loop problems from some Vista SP1 users dating back to late January, before Microsoft distributed the prerequisites for SP1 — right around the time the company delivered the final bits (in the form of the Vista Service Pack 1 Release Candidate 1 Refresh 2 build). Source: Microsoft suspends distribution of Vista SP1 prerequisite update
