电脑喇叭发出哔哔声，定期
Screen sometimes flicker
屏幕闪烁
System crashes for no reason
系统崩溃没有理由
Denial of Service (DoS)
拒绝服务
Files/directories disappear 文件/目录消失
How to prevent virus
Macro Virus
Changes code whenever it passes to another machine. 更改代码，每当它传递到另一 台机器
多态病毒

宏病毒
多分体病毒
General virus types
A Trojan horse is simply a computer program that claims to do one thingbut instead does damage when you run it. 木马程序是一个简单的计 算机程序，要求做一但当 你运行时却造成破坏。 An e-mail virusmovesaround in e-mail messages, and usually replicates itselfby automatically mailing itself to dozens of people in thevictim's e-mailaddressbook.
姓名：吕洪洋 班级：14通网 日期：2015.11.30
Computer Virus
A virus is just a computer program 病毒只是一种计算机程序 It shares some of the traits of biological viruses 它分享了一些生物病毒的特性 Thousands of variations of viruses 病毒的变异 When the computer is virus attack
通过使用杀毒软件来防范病毒攻 击，当然，它是最有效和最直接 的方式。
系统漏洞往往是病毒突破攻击。因此及时 安装系统补丁可以允许病毒不能攻击计算 机系统
Software Updates
Updated software can effectively prevent virus attacks
Safety Online
Update the System Vulnerabilities
System vulnerabilities are often a breakthrough in virus attacks.So timely installation of system patches can allow the virus can not attack the computer system
一封电子邮件病毒四处移动电子邮 件，通常通过自动将自己复制到受 害者的电子邮件地址簿中的几十个 人。
hides its presence by making an infected file not appear infected 隐藏它的存在，使受感染 的文件不会出现感染 A worm is a computer program that has the ability to copy itself from machine to machine. Worms eat up storage space and slows down the computer but don't alter or delete files. 蠕虫是一种计算机程序，它可 以从机器到机器复制它自己的 能力。蠕虫吃上了存储空间， 减缓了计算机的速度，但不改 变或删除文件。
病毒只是一种计算机程序。其他程序，它包含的说明告诉你的 电脑该做什么，但不同于应用程序，病毒通常告诉你的电脑做 一些你不想做的事，和它通常可以传播到你的其他文件电脑— 和其他人的电脑
General virus types
Boot Sector Virus
引导扇区病毒
Macro Virus
宏病毒
Multipartite Virus
当计算机病毒攻击
What can we do to prevent virus
我们能做什么来阻止病毒
What is a virus
A virus is just a computer program.Like any other program, it contains instructions that tell your computer what to do.But unlike an application, a virus usually tells your computer to do something you don't want it to do, and it can usually spread itself to other files on your computer -- and other people's computers.
Virus Attack
Software Updates
How to prevent virus
Antivirus Software
Through the use of anti-virus software to prevent virus attacks, of course,it is the most effective and direct way.
多分体病毒
Polymorphic Virus
多态病毒
Stealth Virus
隐形病毒
E-mail viruses
电子邮件病毒
Worms
蠕虫
Trojan horses
木马
General virus types
While there are thousands of variations of viruses, most fall into one of the following general categories, each of which works slightly differently.
虽然有成千上万的病毒变异，大多数属于下列一般类，其中每一个 作品略有不同。
General virus types
Boot Sector Virus引导扇区病毒 Multipartite Virus Polymorphic Virus
Replaces or implants itself in the boot sector. This kind of virus can prevent you from being able to boot your hard disk. 取代或植入本身在引导扇区。 这种病毒可以阻止你从你的硬 盘上启动。 Written using a simplified macro programming language, these viruses affect Microsoft Office applications, such as Word and Excel 用一种简化的宏编程语言编写，这些 病毒会影响到微软办公应用程序，比 如说词和表格 Infects both files and the boot sector-- a double whammy that can reinfect your system dozens of times before it's caught. 感染文件和引导扇区——祸不单行， 再次感染你的系统在这几十次了。
为什么计算机病毒被命名为病毒？它是一个真正的病毒？当然我们知道这不是，但这 确实是他们之间有一些共同的地方计算机病毒被命名为病毒，因为它有一些生物病毒 的特性。
Why it's named virus
Computer virus Biological virus
A computer virus passes from computer to computer like a biological virus passes from person to person.
计算机病毒从计算机到计算机生物病毒通过人与人。
A biological virus is not puter viruses also can not reproduce by themselves
生物病毒不是活病毒，计算机病毒也不能自己复制
A biological virus inject itself into a cell.A computer virus inject itself into a program or document
Viruses are everywhere
病毒无处不在
Symptoms of Virus Attack
Computer runs slower then usual
电脑运行速度较慢
Computer no longer boots up
计算机不再启动
PC speaker beeps periodically
Safe use of the network can make the computer far from viruses
Firewall and User Rights
Set firewall and user rights can prevent the virus from running
更新软件能有效防止病 单击添加 毒攻击
Why it's named virus
Computer viruses?OR biological viruses?
计算机病毒？或生物病毒
Why the Computer virus is named virus? Does it is a reallly virus? Of course we know it's not,but it is really that there are some commons between them Computer virus is named virus because it shares some of the traits of biological viruses.