Microsoft has released an update for Internet Explorer

When visiting a Web page that uses a custom pop-up object, Microsoft Internet Explorer 6 can close unexpectedly and generate 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. After you install this item, you may have to restart your computer.

Update for Internet Explorer for Windows XP Service Pack 2