another reason to like Jeffrey Zeldman, css links and more...
More updates for security breaches in XP from Microsoft, along with hissy all-capped imperatives: YOU MAY NOT PROVIDE THIS UPDATE OR THE LOCATION (URL) OF THIS UPDATE TO ANY THIRD PARTIES.
you'll have to follow the Microsoft url trail... for the location of the update... Here's an rss feed from Thunderman, so you can attempt to track updates yourself...