You should know what this is.  Tomorrow is the day of the Conficker Worm, and it’s likely that some of your clients will have it.  USA Today gives a simple test to see if you’re infected.  The worm blocks over 100 websites, so simply ask clients if they can reach www.microsoft.com, www.mcafee.com, www.trendmicro.com, or Symantec’s site, and if they can they’re good (according to USA Today).   

What does this worm do?  There seems to be some confusion and ambiguity here. I don’t have it so I don’t really know.  But USA Today mentions everything from “nothing major”, to “Cyberwarfare”.   In either case, you may have people asking, so a quick read of the USA today article might be prudent.

http://blogs.usatoday.com/technologylive/2009/03/how-to-diagnose.html