Viruses, worms and Trojan horses - what are they?

Viruses, worms and Trajan horses (or trojans) are malicious files on your computer that could spread throughout your computer, and via the internet by the computers of your family and friends. If you are not useless by just browsing, you run little risk in such files. This article gives you information about viruses, worms and trojans.

What is a virus?
A computer virus is a program that is committed to create a file in this way can spread themselves. Viruses are designed to corrupt certain files on your computer. Viruses can also easily pass from one computer to another by simply mails or distribute Messenger messages.

Viruses can vary in severity. Some viruses simply make for a slow computer, slow internet, they are just tricky. So, it if better to know how to fix a slow computer and speed up computer performance. But there are other serious viruses, they can destroy your computer throughout. It may even be so serious that your PC is no longer useful. Fortunately, large viruses not easily dispersible, man should (unconscious) between the opportunity to continue to help spread. Online virus information comes handy to resolve many issues related to virus.

What are worms?
Worms are similar to viruses, but they are serious. A virus can not spread, a worm, can do it. First worm takes a hold of the functions on the computer information or files are sent. Once in your PC is automatically disseminate by e-mails to all your contacts. Because worms from spreading through a program or file as "hosts", they can also set your system to make someone else the opportunity to remotely control your computer.

What is a Trojan horse?
Just like the real Trojan horse, which first seemed to give the enemy but it was full to sit with Greek soldiers who want to conquer the lot, so today's Trojan horses are programs that appear to be useful but very harmful codes. Trojan horses can be easily e-mail sent, sometimes as an update file sometimes something else.

Trojan horses can be spread by mail, but also the free software you can download from untrusted sites. So caution is the message.

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Virus may be understood that all the harm to the computer, to penetrate a computer illegally. When the machine is infected usually have symptoms or slow some of the unusual activity. Antivirus security program will scan through each file to find the virus and destroy it. If not destroy it will remove or isolate infected files to keep safe computer.

Some anti-virus programs are quite familiar, such as Norton Antivirus, AVG Free ... are anti-virus programs are used quite popular in Vietnam. Also, for some viruses domestic (originated in) the D32 Bkav and sometimes the choice is effective. Virus domestic as much spread abroad, so the foreign become disabled.

You can read more about finding the virus to learn more about the functions of most of the comparison, but in fact are not necessary because the programs we listed the programs have been long-term experiment, reaching performance, compatibility and high-friendly.

On the use of each specific program, we can not guide you step-by-step, but common goals, each program including antivirus functions, such as scanning files (scan) to find the virus. Each custom program that you will have the option to scan the whole disk, scan each individual folder or specific files, scan the CD ROM, USB disk, etc. ..

Function as the second function on the list and periodically scan machines (schedule) as well as automatic periodic update (updated) list of new born virus.

And function Virus Shield, Virus Protection, automatically scan directly all the files on the computer. Main features this machine will not take you spend less resources and slow the machine see. If you do not connect to the Internet, you should turn off this computer to work faster, but must be very careful when you put a floppy disk, CD, USB to computer.

In addition, many online virus help programs regularly monitor the status of the computer, record the activity loss is often considered as the virus changes a default configuration, and information on a hard disk or the France etc. ... and to inform you know. You carefully read all the notice for that computer do anything. It is good to have an understanding of antivirus and antispyware.

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Virus and anti-virus

As long as there are existing programs, there also exist some idiots who thought that it was uncontrollable funny to sabotage those programs with malicious program codes - small malicious programs, all known under the common name "Computer virus". Virus appears in innumerable forms and variations. To mention them all would be impossible, and also quite superfluous, for which new virus types every day.

Sources of computer virus

The most common sources of input virus on your computer, your mail program, your Internet movements and various forms of downloading, which of course also related to your Internet connection. The so-called P2P programs (peer to peer) is a major source of spread of virus and spyware. Examples of these are programs like Kazaa and LimeWire and others. Avoid also the use of such programs functioning on "folder sharing" with unknown users on the network. Diskettes has previously posed a great risk, but as the use of these disappear, this is obviously equivalent waning. It is still a good idea to scan the disks for viruses or learn lessons from getting hit by a computer virus.

Mail Program
Virus programmers have become considerably more sophisticated. For instance, it is very normal to be sent to the virus from an apparently well-known mail address - even if the mail actually did not come from a familiar address. Viruses can also be compressed completely innocent appearance files as an image file or a PowerPoint presentation. Never put your mail on the web in the chat forums or similar. Disable the automatic reading pane / preview pane in your email program so that a mail only opens when you double-click it - and do not ever open an email you are suspicious of, or mail containing attachments, which spontaneously has been sent to you. Curiosity has given rise to many successful viruses. Be sure to have an updated antivirus support services to secure your computer programs that scans all your incoming and outgoing mail for viruses. Please note that most newer mail programs have a number of settings and options, to some extent actually makes quite a nice protection against unwanted mail. In this context it is very important that at any time with both its browser and its mail program updated with the latest updates.

Internet
Surfing the Internet is a significant risk - especially if you surf on the porn and gaming sites. Not because these pages are worse than others, but they are very popular and have high traffic and is therefore also a popular target for the rapid spread of virus and spyware. Never surf the web without having a good and nyopdateret active antivirus program - a firewall is in this context almost equally important.

Peer to Peer - P2P
The measures of the so-called peer to peer programs as Kazaa LimeWire and others, is quite clear and simple: They are not recommended, - but they are extremely popular because they are a good and tempting opportunity to share movies, pictures, music and programs and more.

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What should you do if your computer is already infected with a virus?

Most of virus infections can not be detected from within the affected system while it is running mode. The most effective way to remove an infection is to format the entire system Hard Drive, and then reinstall and secure your operating system and needed applications. But it should be your last step. If you plan to format your computer and install a fresh operating system try to do these mentioned things:

Install Good Anti-Virus like Symantech, McAfee, AVG etc. :- If you have your previous Antivirus security installed in your computer, just uninstall it before doing this step by going to the Control Panel and choosing Add/Remove Programs. After uninstall, now you can install your new one antivirus software. By this way you will learn how to have an effective antivirus installation.

If you are using Windows XP Windows ME Operating system, it is recommended that you should turn off System Restore Option.
1. Right click on My Computer and choose properties.
2. Click on the System Restore tab
3. Place a check mark in the box for “Turn Off System Restore.

After that now you are ready to scan your computer against viruses. It is better to scan your computer in safe mode of operating system, because in safe mode all viruses are in sleep mode, so killing the viruses could be easy task. Therefore boot your computer into Safe Mode.
1. Restart your computer.
2. While your computer is rebooting, press F8 to bring up a menu of boot options. NOTE: You must press F8 at the moment just before Windows begins to load. Choose Safe Mode.

Process how to Scan your computer?
In the term of Symantec Client Security, follow these steps:
1. Go to Start, Programs, Symantec Client Security, Symantec AntiVirus Client.
2. Look on the lower right of the window to confirm that the virus defintion files are current (they shouldn’t be more than a week old). If the files are not recent, call the 1-HELP Technology Helpline.
3. Choose Scan, then Scan Computer.
4. Select your local hard drive (usually the C: drive)
5. Click the Scan button. NOTE: this can take a very long time.
6. When Symantec AntiVirus finds an infected file, choose the option to remove the infection, or or try prevention programs and kill all kinds of virus

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