The technology company Microsoft is  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    with America's National Security Agency (NSA). Microsoft said the WannaCry ransomware cyber- angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    happened because the NSA keeps lots of cyber-weapons on its  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet   . Ransomware is a type of  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    software that blocks access to a computer until the  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    of the computer pays money (a  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet   ) to the hackers. The NSA is America's  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    intelligence organization. It helps to keep America's communications and information systems  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet   . It is also responsible for stopping cyber-attacks against the USA. However,  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    say the WannaCry ransomware used computer spying tools  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    designed by the NSA.  Microsoft president Brad Smith said governments needed to wake up to the  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    of storing cyber-weapons that hackers can steal. He said it was as big a  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    as someone stealing  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    from the USA. When talking about the WannaCry attack, he said: "This attack provides  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    another example of why the stockpiling of [these things] by governments is such a problem." The European  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    agency Europol said WannaCry has affected 200,000 computers in 150  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet   . In the UK, WannaCry caused many problems with the work of Britain's National Health Service. Many  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    were cancelled. Experts warned people to back up their  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    because a  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    wave of  angry attack attacks computers countries experts files harmful military missiles operations originally owner police problem ransom safe second yet    could come.