About Conficker (also called Downup, Downandup and Kido) is a kind of worm that appears in the October 2008 month. Windows Conficker this attack and found in most series of Windows XP. Microsoft released a patch to stop this worm on 15 days in October 2008. Heinz Heise estimate Conficker has menginfeksi approximately 2.5 million PC on 15 January 2009, while The Guardian estimated that 3.5 million have been infected PC. On 16 January 2009, this worm has been almost 9 million menginfeksi PC, making it one of the most infections spread quickly in a short time.