On Oct 13,2009, Microsoft has release the IE Cumulative Security Update for October 2009. This update addresses three privately reported vulnerabilities and one publicly disclosed vulnerability as per Microsoft in its MSDN Blog.
The security update addresses these vulnerabilities by modifying the way that Internet Explorer processes data stream headers, validates arguments, and handles objects in memory. To know more about the update, visit:
http://www.microsoft.com/technet/security/Bulletin/MS09-054.mspx
http://support.microsoft.com/kb/974455
However, some of the users have reported that installation of the cumlative update 974455 causes “Type Mismatch” error.
Do run our FiX IE utlity to resolve these issues.
Post with any other issues that you may have for further assistance.