My laptop (Vista, Office) running NIS2009 (defaults) just updated via Windows Update and on restart the "Microsoft Windows Malicious Software Removal Tool - June 2009" dialog box popped up and message said "Malicious software was detected and removed from your computer - click to view details". I clicked and it said that "Trojan:Win32/Alureon!inf" had been detected and deleted. Should I be worried? Bit concerned that NIS2009 running defaults didn't pick this up.