How does a virus enter the computer?

Answer 1

A computer virus is a computer program that can copy itself and infect a computer without the permission or knowledge of the owner. The term "virus" is also commonly but erroneously used to refer to other types of malware, adware, and spyware programs that do not have the reproductive ability. A true virus can only spread from one computer to another (in some form of executable code) when its host is taken to the target computer; for instance because a user sent it over a network or the internet, or carried it on a removable medium such as a floppy disk, CD, DVD, or USB drive. Viruses can increase their chances of spreading to other computers by infecting files on a network file system or a file system that is accessed by another computer.[1][2] In order to replicate itself, a virus must be permitted to execute code and write to memory. For this reason, many viruses attach themselves to executable files that may be part of legitimate programs. If a user attempts to launch an infected program, the virus' code may be executed simultaneously. Viruses can be divided into two types based on their behavior when they are executed. Nonresident viruses immediately search for other hosts that can be infected, infect those targets, and finally transfer control to the application program they infected. Resident viruses do not search for hosts when they are started. Instead, a resident virus loads itself into memory on execution and transfers control to the host program. The virus stays active in the background and infects new hosts when those files are accessed by other programs or the operating system itself. http://en.wikipedia.org/wiki/Computer_virus#Infection_strategies

Answer 2

A computer virus can be introduced in a variety of different ways. These include email/USB Thumb Drive (in fact any removable media)/ and simply visiting websites which download malicious cookies onto your computer (most websites automatically download data when you visit them). These are just a few ways, there are many more.

Answer 3

There are multiple ways a virus can infect your computer. Over the past few years though Computer Viruses have become much more advanced. A computer virus is an executable file which is normally created for some sort of malicious intention. It used to be the case that you had to knowingly upload a file to your harddrive to be infected with a virus when person computers were first introduced, but with the invention of the internet, that is no longer the case. When you click a link on a website you are making a direct connection with another computer, thus exposing your computer to a possible attack. When you open any file: e-mail, pictures, documents, you again are accessing unknown information and giving it access to your computer. I'd say 90% of viruses on personal computers come from a user accessing email, or a website. The other 10% I'd say are pre-planned by an individual with a specific purpose that uploads the virus at the workstation they are trying to infect. Luckily there are a great number of fantastic software titles out to prevent these sorts of events. My personal favorite is AVG Virus Scan and Web Security... It's 100% free, just Google AVG download, and it will take you right to the site. As long as you have a good security package and a firewall running there isn't much to worry about.

Answer 4

quite a lot of ways really

most common being getting a strange message from pop ups over the internet or they can come from competitions eg. apples 'how many triangles?' and trying to open it - this may give you the virus

Answer 5

from a website (use anti virus and anti spyware)

from an email (let the anti virus scan your emails)

from a pen drive/usb drive (scan with anti virus)

from an infected cd/dvd (use threat fire)

from the network (use a firewall)

Answer 6

Answer

This is an excellent question. First you must know what a virus is before you can understand how they are spread. A virus is a type of malware. Malware is malicious code that either harms your computer or does an action without the user's knowledge (like deleting your files). There are many types of malware and viruses, spyware, adware, worms, trojans and rootkits are few types of malware. Each have a few unique characteristics but they are all spread the same way.

Viruses and other malware are usually spread by visiting a malicious site or running a malicious file (like the suspiscious attachments you find in spam emails). When you visit these sites or run these files the malicious code is ran on your computer and when this happens your computer becomes infected with malware.

To protect yourself you should avoid opening spam and suspicious emails, visiting adult websites and using removable media such as thumb drives and cds that are not yours. This is because malware has been found to copy itself to thrumb drives for example and when you connect it the malware then infects your computer. To also protect yourself download an anti-malware program. I recommend you download Avast Free Antivirus. You can find it here:

http://www.avast.com/en-in/download-thank-you.php?product=FA-ONLINE&locale=en-in

If you have any questions feel free to message me

ComputerGuru

Answer 7

because you are downloads that detect virus and you need to reformat it.....

:D

Answer 8

Either by downloading malicious files or by inserting infected usb drives in your pc

Answer 9

By Downloading Setup.exe Or Going on a Dangerous site And last is going on a danger site and downloading anything on it, Never do the Stuff here.