Microsoft has released an important update to Internet Explorer to protect against a serious vulnerability. User who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.
http://support.microsoft.com/kb/294871

More information concerning this issue can be viewed at
http://www.microsoft.com/technet/security/bulletin/ms10-002.mspx