随着黑客的出现，从防病毒程序到防火墙的层层安全措施被添加进来，试图阻止他们。
As hackers turned up, layers of security, from antivirus programs to firewalls, were added to try to keep them at bay.
使用这种模式，可以在一个已知的网络攻击或者病毒程序沿着网络传播期间，暂时地锁定电脑。
Use this mode to temporarily lock down computers during a known network attack or when a malicious program is spreading.
有四种类型的病毒程序：外壳型、入侵型、操作系统型和源码型。
There are four main types of viruses: shell, intrusive, operating system and source ode.
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