This patch is extremely important all, this flaw is being exploited widely.
A security issue has been identified in the way Vector Markup Language (VML) is handled that could allow an attacker to compromise a computer running Microsoft Windows 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.
More information for this update can be found at Vulnerability in Vector Markup Language Could Allow Remote Code Execution (925486)