A global ransomware crisis: Literally tens of thousands of computers have been infected and some people are paying the $300 ransom. It appears to have crippled the British National Health Service. It's so bad that Microsoft has issued patches for Windows XP and Windows 8, both of which are "no longer supported". That's a big concession and an indication of just how significant the attack really is. As is so often the case, the best preventive measure is to make sure that your operating systems are fully up to date. Reputable sources say the NSA used the same vulnerability in the past to spy on computers.