Virus discussion: how to understand, prevent and eliminate viruses

What are viruses and how to prevent and eliminate viruses? There are different opinions on this topic. Some people say that everything is fine if they have a powerful anti-virus software. Others say that they can resist viruses as long as they do not access the internet. Others think that, as long as the hard disk is formatted regularly, the virus is in the bud ...... In the face of various sayings, I feel that they have seen the virus amazing, or they do not know much about the virus, and they do not know much about the prevention and elimination of the virus.

Virus Recognition

Virus refers to a piece of program or command code that can damage the computer system, affect the computer's work, and achieve self-replication. With the development of the computer industry, virus programs are emerging one after another. By the 21st century, the number of virus programs has reached tens of millions. Although there are many types of viruses, the variants of the virus cannot be calculated, but there are only four types of infected objects: BIOS, hard disk boot area, operating system and application virus.

After knowing the definition and classification of viruses, let's take a look at what exceptions will occur after the computer is infected with viruses:

BIOS Virus

1. Black screen suddenly after several seconds of startup

2. external devices cannot be found

3. Hard Disk cannot be found

4. Strange computer sound

Hard Drive boot zone Virus

1. Hard Disk cannot be started normally

2. crashes during guidance

3. "Not ready error drive A Abort, Retry, Fail?" is displayed during disk C execution ?"

Operating System Virus

1. the boot system takes longer time

2. The computer processing speed is obviously slower than before

3. inexplicable loss of system files, extended bytes, and date Modification

4. The system generates some special files.

5. the driver is modified so that some peripherals cannot work properly.

6. Loss of soft drive and optical drive

7. The computer Often crashes or restarts.

Application Virus

1. The "invalid error" dialog box appears when you start the application.

2. Application Files become larger

3. applications cannot be copied, moved, or deleted.

4. A large number of invalid files appear on the hard disk

5. Some programs run with longer loading time

Virus prevention

Computer viruses can cause us a lot of unnecessary troubles. Therefore, it is imperative to prevent viruses. Below I will introduce some measures to prevent viruses:

I. Eliminate transmission channels

The virus is infected in two ways: one is the network, and the other is a floppy disk and a CD. Nowadays, due to the prevalence of email, the virus transmitted over the Internet is much higher than the latter. Therefore, we need to pay special attention to online behavior.

1. Do not download the software and programs of a small website easily.

2. Do not patronize small websites that are tempting, because these websites are likely to be Web traps.

3. Do not open any emails or attachments with unknown origins.

4. Install the firewall provided by genuine anti-virus software companies, such as Symantec's personal firewall software, and always enable it.

5. Do not start or read some files online. Otherwise, you may become a disseminator of Network viruses.

6. send an email to you frequently to see if you will receive the second email with no subject or accompanying program.

I want to prevent viruses from being infected with floppy disks and CDs by not opening programs or installing software. You can copy the file to the hard disk, Use anti-virus software to check it again, and then run the installation or open command.

2. Set the attributes of the infected object

Virus is actually a program or command code. It mainly targets files ending with EXE and COM. Due to its inherent limitations, therefore, another way to prevent viruses is to set the attributes of the infected object, that is, to set all files with the extension EXE and COM to "read-only ". In this way, even if the virus program is activated, it cannot perform write operations on other programs, and the executable program cannot be infected. Therefore, the damage function of the virus is greatly restricted.

Macro virus

It is no exaggeration to say that almost all the friends who use Word have met the macro virus. Macro virus is generated mainly because the Word itself is equipped with a built-in language. Simply put, it has programming functions. Therefore, many people with ulterior motives use this function to create a macro virus. Although the damage of the macro virus is not great, it is indeed a burden for people who rely on the pen to make a living. For this reason, I hereby tell you some ways to detect and prevent the macro virus.

I. macro virus detection

Macro virus detection is actually very simple. You only need to click [tools] → [macros] → [macros] in the menu bar on the Word interface. then, in the macro name list, check whether there are AutoExce and AutoOpen automatic macros.

Ii. Prevention of macro virus

Macro viruses usually reside in the macro of a document or template. If such a document or template is opened, the macro virus is activated and the virus enters the Normal. dot template file. To prevent the macro virus, you can use the following methods:

1. Use Word to clear macros (viruses. When Word identifies an open document with an automatic macro execution, a dialog box appears asking you to select whether to enable the Macro. To prevent the macro virus, select the [cancel macro] button.

2. Create an AutoExce macro in the Normal. dot template file. The Code is as follows:

"Sub Main

DisableAutoMacros 1

End Sub"

In this way, the operation of other automatic macros can be prohibited to prevent macro virus infection. Note that this program is completed in the Word "tool/macro/Visual Basic Editor.

3. Save the file as TXT (plain text file) or RTF (text file, but may include other non-text file information, such as images and tables ).

In fact, you don't have to be afraid of the virus, or even be afraid of it. After all, people who create the virus are not gods. As long as you know and prevent the virus, I think it will not be so arrogant. In addition, many anti-virus software vendors have provided us with software with complete functions. All you need to do is to regularly upgrade and scan and kill the software on a regular basis. I hope this article can help good computer enthusiasts and eliminate the troubles and troubles caused by viruses!