If you are running the latest version of Internet Explorer on the older Windows Service Pack 1 (SP1) version, be warned. According to CNET News.com, the recent MS06-042 security update for Internet Explorer 6.0 introduces a serious new security flaw for systems which do not have the latest Service Pack 2 (SP2) for Windows XP installed.
Released as a solution to browser crash issues, the MS06-042 update may result in a "buffer overrun" problem that could be exploited by hackers. Those with Windows XP SP2 and Windows 2003 are not affected. For those who insist on keeping their older SP1 version, Microsoft suggests disabling the use of Hypertext Transfer Protocol (HTTP) version 1.1 in the browser.