QUOTE
File Name: WindowsXP-KB927891-v2-x86-ENU.exe
Version: 927891
Knowledge Base (KB) Articles: KB927891
Date Published: 2/20/2007
http://www.microsoft.com/downloads/details...ylang=en&tm

Install this update if you receive an access violation message when you try to install an update from Windows Update after you apply hotfix package 916089.
http://support.microsoft.com/?kbid=927891

QUOTE
FIX: When you run Windows Update to scan for updates that use Windows Installer, including Office updates, CPU utilization may reach 100 percent for prolonged periods.
http://support.microsoft.com/kb/916089/