Ah, so it is coming from your browser session and you are having an issue with Hotmail and are not using Windows Live OneCare. Support for Windows Live Hotmail can be obtained via http://support.live.com, selecting Windows Live Hotmail from the list of programs.
You're off topic for this forum, which is dedicated to Windows Live OneCare. You may want to try the Windows and Internet Explorer newsgroups here: http://www.microsoft.com/communities/newsgroups/en-us/default.aspx
-steve