Thats interesting. Good news for XP users.

Srinath Sadda wrote  Ankur Mittal wrote Security issues have been identified that could allow an attacker to compromise a computer running Microsoft Internet Explorer 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.   For every update Microsoft gives this message. Why ?

For this U have to ask MS itself