This seems to be an out of session Critical Windows XP SP2 SP3 Update so i'm post it here.
http://www.microsoft.com/downloads/d...DisplayLang=en
Overview
A security issue has been identified that could allow an unauthenticated remote attacker to compromise your Microsoft Windows-based system and gain control over it. You can help protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer.