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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
What else can I help you with?
How can a virus enter a computer having antivirus software installed in it?
a virus can enter your protected computer by being powerful enough to get inside your firewall.
Definition of virus?
Virus is software which is enter up & destry of computer functional pogramma
What is the Trojan horse for in computer terminology?
The trajan horse is used to allow the virus to evade detection and enter the computer.
How does a virus enter in your system?
A virus enters the system either by internet (email, downloads, or giving out info) or by infiltration of your computer (a flash drive, black bag job, writing the computer virus on your computer). Internet viruses are more common, as they are easier to spread.
Is it possible for someone to hack into you computer and see what your doing?
Yes it is,virus' like these are called spyware and are used by hackers to spy on what you do in your computer once they enter your computer
How do you delete the virus in the computer?
Every time you do surfing numerous viruses automatically enter your computer. Therefore, you can remove virus by installing a good anti virus on PC and perform scanning regularly. You can also use online scanner if you want to remove virus as quickly as possible.
The diffence between human virus and computer viruses?
Human viruses take over human cellular functions. These human viruses have either RNA or DNA instruction sets surrounded by a protein coat. After these instructions enter the human cell, they co-opt cell functions to perform duties the virus wants done. Computer viruses take over computer functions. Computer viruses are programs created by humans and have a series of 1's and 0's to make up instruction sets. After these instructions enter the computer, they co-opt computer functions to perform duties the virus wants done. So, the biggest difference is that the human virus instruction set is encoded in biological molecules of RNA or DNA, and the computer virus instruction set is encoded in 1's and 0's that the computer sees as a program to run.
What viruses travel from computer to computer on their own?
No virus is alive, therefore it can not more on its' own.
Does a computer with no display have a virus?
Every computer could have a virus but if you use your computer carefully it can be impossible for the virus to come to your computer.
What computer program is designed to surreptitously enter a computer program gain unauthorized access to data or disrupt normal processing operations?
computer virus
What are discussion forums which focus on computer virus issues called?
Virus-L and computer virus are discussions forums which focus on computer virus issues
What is difference between scanning virus and removing virus?
Scanning virus only help to find the virus inside your computer disks, but do no other actions, virus is still in your computer. But Removing virus not only find it, but also remove the virus from your computer. Thus no such virus will remain in your computer after that.
