What is IS vulnerability and Computer crime?How can we protect IS from various security threats?

What do you mean by IS vulnerability and Computer crime? How can we protect information system from various security threats?

Is the Pc security 2009 in my computer completely gone?

I had this Pc security 2009 installed in my computer whcih is a scam and i used Spyware doctor to remove it and the virus my computer still seem to be very laggy then the computer before i dont had this problem. do i need to reboot it or do anything?

East Turkestan: Cyber-Attacks Mark Anniversary of Urumqi Unrest – United Nations and Peoples Organisation

In late 2009, WUC´s website was entirely destroyed through hacker and virus attacks … report published in May 2011 that “cyber-attacks, or attempts to undermine or compromise the function of a computer-based system, include measures such as hacking …
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computer security and and human psychology?

does computer security involve knowledge of human psychology?