Internet Explorer KB articles
When you visit a Web page that uses a custom pop-up object, Microsoft Internet Explorer 6 closes unexpectedly and generates an error in the Mshtml.dll file. This problem occurs after you install security update 918899 on a Windows XP Service Pack 2 (SP2)-based or a Windows Server 2003 Service Pack 1 (SP1)-based computer. A hotfix is available if you are severely affected by this problem. Otherwise, we recommend that you wait for the next cumulative security update for Internet Explorer.
http://support.microsoft.com/default.aspx?scid=kb;en-us;923996
Microsoft has released security bulletin MS06-042. The security bulletin contains all the relevant information about the security update. This information includes file manifest information and deployment options.
http://support.microsoft.com/default.aspx?scid=kb;en-us;918899