For those who are infected and can't do a Windows Update - Here is the MS info page re: msblast with a link for the patch.
http://search.microsoft.com/search/r...exe&View=en-us
Note according to this Bulletin the patch is ONLY for computers using the NT platform : NT 4.0, Windows 2000, and Windows XP. Did a Windows Update search and there is no patch for Win 95/98 so apparently it is aimed at the newer Windows machines.