A computer virus is a type of malware that, once installed on a computer system, can cause extensive damage. Viruses are often spread through email attachments, downloads from the internet, or shared files and folders.
Once infected, the virus can take control of the computer system and make changes to its settings or even delete data.
There are many different types of viruses that can infect computers, but all share some common characteristics. Most require human interaction in order to be transmitted—either by clicking on an attachment in an email or downloading a file from a website.
Additionally, most attach themselves to other files so they can be executed when the file is opened. This means that simply opening an infected file could activate the virus and start causing damage to your computer system.
Viruses can also spread rapidly between computers if they are connected together in networks such as office buildings or schools. And while anti-virus software programs offer protection against many known viruses, new ones continue to appear all the time so it’s important for users to keep their software updated regularly.
There are various methods that users can employ to try and rid their computer of this unpleasant invader: scanning for them using up-to-date software; manually removing suspicious files; restoring backups from before infection occurred; or reformatting/wiping clean their hard drive altogether (though this should really only be done as a last resort).
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There are many different types of viruses out there with different capabilities and effects. Some common ones include:
1. Trojan Horse Virus
A Trojan horse is a type of malicious software that appears to be something else, such as a legitimate file or program, in order to lure users into installing it on their computer. Once installed, the Trojan horse can then run any number of nefarious activities on the victim’s machine, such as stealing passwords and personal information or even sabotaging the system.
Trojan horses are one of the most common types and can be very difficult to detect. They often masquerade as harmless files or programs that people might want to install, like updates for popular software applications.
In some cases they may even come from trusted sources like your friends or family members. It’s important not to fall for these scams and always double check what you’re downloading before opening it up!
2. Boot Sector Virus
A boot sector is a computer virus that attaches to the startup code of a computer’s operating system, making it difficult or impossible for the user to start up their machine. Some viruses will even rewrite the infected sector so that recovery or disinfection is either very difficult or impossible.
Boot sector viruses are usually spread through infected floppy disks and other removable media such as USB flash drives. They can also be transmitted through email attachments and file-sharing networks.
3. Direct Action Virus
Direct action, also known as DA V, is a computer worm that spreads through removable media and file-sharing networks. It was first discovered in 2004 by Symantec Corporation.
DA V is a self-replicating worm that uses Microsoft Outlook to propagate. The worm searches for .pif files on the infected system and attaches itself to those files. When the user opens an email containing one of these infected files, the virus will infect their computer.
DA V can also spread through shared folders and removable media such as USB drives and CD ROMs. Once it has infected a computer, it will overwrite important system files with copies of itself, which makes the computer difficult to repair or use properly.
4. Multipartite Virus
The term multipartite virus is used to describe a virus that has three or more RNA segments. The majority of these infect plants, and can have serious economic impact on agriculture. For example, the cucumber mosaic virus (CMV) causes extensive damage to crops such as cucumbers, peppers, tomatoes and lettuce.
It was only in the early 1990s that researchers discovered CMV had three genomic segments—an event which overturned traditional thinking about plant viruses which were assumed to have two genome segments at most.
Since then it has been found that other important plant viruses including potato leafroll virus (PLRV), tomato yellow Leaf curl Virus (TYLCV), bean golden mosaic Virus(BGmv) also belong to this group of ‘multipartite’ viruses.
Multipartite genomes pose an interesting problem for viral replication as they must be faithfully replicated by the host cell machinery despite being composed of several different genetic elements.
One way around this is for each segment to possess its own promoter region so that all RNAs are expressed simultaneously from a single transcript template; however not all promoters are equally active leading often to differential regulation between individual genomic segments within a single ‘multi-segmented’ virion particle!
5. Polymorphic Virus
A polymorphic virus is one that alters its appearance with each infection, in order to evade detection by anti-virus software. This can make it very difficult to create a vaccine or cure, as the code used to identify and destroy the virus may no longer be effective.
Most viruses use a ‘template’ of genetic material which they copy into new infections. Polymorphic viruses randomly generate their own DNA sequences for every new infection, making them much harder to detect using standard scanning techniques.
Some types of polymorphic virus are even able to hide all traces of themselves from infected computers; this makes them extremely dangerous as there is no way to know if your machine has been compromised until it’s too late.
6. Resident Virus
A resident virus is a type of computer virus that installs itself on a user’s computer and remains there, inactive, until it detects a specific event or condition. Resident viruses are often activated when the user visits certain websites or opens malicious email attachments.
Once active, they can cause all sorts of havoc on the victim’s system by deleting files, crashing programs, or even rendering the computer inoperable.
While most antivirus software programs include protection against resident viruses, it’s always good to be vigilant about what you open and where you browse online. If your computer does become infected with a resident virus, make sure to install up-to-date programs as soon as possible and run a scan to remove the malware from your system.
7. File Infector Virus
A computer virus is a type of malware that, once it infects your computer, can spread from one file to another on your hard drive. It can also copy itself to other drives or devices connected to your PC, potentially wreaking havoc on your system and data.
One common type of virus is the file infector virus. As its name suggests, this type attaches itself to files on your PC in order to replicate and spread.
File infector viruses are often activated when you open the infected files; they may even display an annoying message or logo while trying to take over control of your machine. In some cases they can damage or delete important files stored on your computer—causing permanent data loss!