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What are the Major Types of Computer Viruses

How a virus infiltrates your computer depends on its type. So it is vital to learn about the diverse types of viruses creeping around in cyberspace and on the outer reaches of your hard drive. The benefit of learning more about types of viruses is dual in nature. First of all, you will gain precious knowledge, and secondly you will be able to better put a stop to and deal with a computer virus whenever it preys your PC or laptop. So let us have a look at the different types of viruses.

Resident Viruses

This virus embeds itself into the computer’s memory, activating whenever the OS performs a particular function so that it can infect files. Resident types of viruses can be quite pernicious, as they might spread via a system so meticulously that they even fasten to antivirus programs, infecting the very stuffs they scan for symptoms of infection.

Overwrite Viruses

These types of viruses will duplicate its own code over the file data of the host PC or laptop and this destroys the original program. Once the computer has been cleaned with an antivirus program, the user will have to get the original program reinstalled.

File Infectors

These types of viruses directly attack and modify program files, which are usually .EXE or .COM files. These types of viruses are commonly spread through infected floppy disks, over networks, and over the Internet.

Companion Viruses

These types of computer virus compromises a feature of DOS that facilitates software with the same name, but dissimilar extensions, to run with different priorities. For instance you might have program.exe on your computer, and the virus may form a file called When the PC executes the program.exe, the virus runs before program.exe gets executed. More often than not, the real program will run so people think that the system is operating normally and are not aware that a virus was run on the system.

FAT Virus

This one attacks the file allocation table (FAT), a system used in Microsoft products and some other types of computer systems to access the information stored on a computer.


These are destructive programs that masquerade as a benign application. Unlike various types of viruses, Trojan horses do not replicate themselves. Some Trojan horse programs claim to rid your computer of viruses but introduce various types of computer virus in its place.

Vishal Gaikar

Vishal Gaikar

Vishal Gaikar is a professional blogger from Pune, India. He is Software Engineer, Web Addicted. At Shake the Tech, he writes on Technology, Gadgets & so on. Follow me @vishal

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