Recommended Update (Windows XP Pro)
This update provides new information about security and privacy. Download now to learn what steps you can take to keep your personal information private and how to make your computer more secure.
System Requirements
This update applies to Windows XP Professional with Service Pack 1 (SP1)
Download: Windows Update v4.
Side Note: Windows XP SP1 Express has also been added to Windows Update, for those of you who have not installed it.

hxxp://v4.windowsupdate.microsoft.com/en/default.asp