Responding to reports of endlessly rebooting PCs from support groups last week, Microsoft said on Tuesday it has pulled the recent updates for the coming Windows Vista SP1

The update is actually a pair of prerequisite files that modify Vista’s install components. This has been temporarily pulled from Windows update and Microsoft has not yet produced a fix for users whose machines either won’t boot or reboot constantly.

“Immediately after receiving reports of this error, we made the decision to temporarily suspend automatic distribution of the update to avoid further customer impact while we investigate possible causes,” said Nick White, a Vista program manager, in a post to the company’s blog Tuesday afternoon.

According to Microsoft’s White: “This problem only affects a small number of customers in unique circumstances.”