..if you haven't protected yourself against blaster 2, here are the links:

windows xp:
http://www.microsoft.com/downloads/details.aspx?FamilyId=5FA055AE-A1BA-4D4A-B424-95D32CFC8CBA&displaylang=en

windows 2k:
http://www.microsoft.com/downloads/details.aspx?FamilyId=F4F66D56-E7CE-44C3-8B94-817EA8485DD1&displaylang=en

article:
http://www.ajc.com/business/content/business/0903/17internet.html?urac=n&urvf=10637941093400.9712941729591718

more info:
http://www.microsoft.com/technet/security/bulletin/MS03-039.asp

webcast:
http://www.microsoft.com/usa/webcasts/upcoming/2373.asp