A critical part of preventing against the WannaCry ransomware is making sure that you have Microsoft's Security Bulletin MS17-010 (also know as Security Update for Microsoft Windows SMB Server). Here's where to go to get it. Windows Vista, 7, 8, and 10: https://technet.microsoft.com/en-us/library/security/ms17-010.aspx Windows Server 2008, 2008 R2, 2012, 2012 R2, and 2016: https://technet.microsoft.com/en-us/library/security/ms17-010.aspx Windows XP (with SP3) x86: http://download.windowsupdate.com/d/csa/csa/secu/2017/02/windowsxp-kb4012598-x86-custom-enu_eceb7d5023bbb23c0dc633e46b9c2f14fa6ee9dd.exe Windows Server 2003 x86: http://download.windowsupdate.com/c/csa/csa/secu/2017/02/windowsserver2003-kb4012598-x86-custom-enu_f617caf6e7ee6f43abe4b386cb1d26b3318693cf.exe Windows Server 2003 x64: http://download.windowsupdate.com/d/csa/csa/secu/2017/02/windowsserver2003-kb4012598-x64-custom-enu_f24d8723f246145524b9030e4752c96430981211.exe