[NOTE date of article, Feb 20, 2008] Responding to reports of endlessly rebooting PCs that flooded support newsgroups last week, Microsoft said on Tuesday it had pulled an update designed to prep Windows Vista for Service Pack 1. Although the update -- actually a pair of prerequisite files that modify Vista's install components -- has been temporarily pulled from Windows Update, 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...