In Cyberattack, Virus Infects 40 Web Sites in South Korea – New York Times

Computer analysts said the problems amounted to a so-called denial of service attack, in which multiple computers infected by a software virus try to access targeted Web sites simultaneously. That can overwhelm the sites with a surge of traffic that …
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whenever I switch on my computer, why does window security center shows that my computer is at risk ?

My windowdefender is turned off and security center does not recognises anti virus installled. Is my computer hacked ? Is my computer is at risk? I have installed mcafee virus scan. Is it enough or a new upgrade is needed? Why does it happen ?
Please suggest some solution.

South Korean Websites Hit by Distributed Denial-of-Service Attacks – PRLog (free press release)

The compromised systems are than used to attack and infiltrate other computers. Users must install anti-virus and anti-malware programs to protect their computers from virus and malware attacks. E-learning, online degree and training programs may help in …
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