Can a virus be prevented from entering a computer? Why or why not.?

Question

How do an anti-virus program detect a virus?
How is a virus made?

Answer 1

Okay, yes a virus can be prevented, if you have the right set of software
now the other questions are hard to explain...

Answer 2

Any particular virus can be prevented from entering a computer. Anti-virus programs usually have some component (often called an "on-access scanner") which examines every file you copy or execute. It searches the files for small tidbits of the viruses it knows about. (Please note that this is *very* simplified - modern scanners use much more complex techniques.) If one of them is found, access to the file is forbidden - and if you cannot execute it, the virus inside cannot get into your computer.

Generally, however, it is not possible to prevent all viruses without making the computer unusable. First of all, the problem of whether a program is a virus or not is algorithmically unsolvable in the general case. That is, it is impossible to write a program that would tell whether *any* program is a virus or not without making mistakes. However, it is perfectly possible to design an algorithm that detects hundreds of thousands of known, particular viruses.

Second, there are only three ways to make viruses impossible: limit functionality (you can't get a virus for your microwave oven's specialized computer), limit sharing (if you don't add any files to your computer, you can't infect it) and limit transitivity of the information flow (i.e., if A can pass information to B and B can pass information to C, from this must not follow that A can pass information to C). However, none of these three ways is practical.

A virus is just a program that replicates itself. Just about any idiot can create a virus - and many of them do so. There are even virus construction kits - programs that create new viruses automatically.

Answer 3

Yes.
Yse Anti-Virus Programs like Norton Anti Virus McAffe
etc.
Will Protect ur PC

Answer 4

Lol Making virus is very difficult and challenge for programmer.... a programmer's knowledge is tested... by virus programming... since virus programming is A CHALLENGE FOR PROGRAMMERS.... i made worm but it was not much harmful..

well there are lots of thing done when virus is programmed like... when virus gets deleted by anti-virus or detected it creates another file... itslef in somewhere .... well lots more...

Yea anti-virus detects because the scrpiting of an application can be readed by them yea EXE files... they can read codes... if find anythin suspiscious then... checks.. type... trojan or worm or anyother and shows you result... removing virus is easy for AVS but repairing them is almost impossible where as i know....

you can use Visual basic to create virus... C++ Made virus are less possibly to get detected... since lots of thing can be done through C++ since it's object oriented language... i don't know C++ .. it's too hard..

Answer 5

A virus is just plain computer programming code doing what the coder wanted it to. Usually send emails so it can grab email addresses is one way of doing it. If you have anitvirus installed and updated it will find most viruses before they get a chance to do anything, especially email viruses. But some viruses get into the wild before the companies have their updates written, so sometimes they get through. These are called 0-day viruses.

Trojans are a bit different. They need to install on your computer so they can do something. They don't try and spread. Many of them are associated with spyware and spyware type malware. Some of these need you to go through special procedures that will remove them properly.

Antivirus software uses known virus signatures to identify viruses specifically. They also use heuristics to detect virus like behaviour.

Answer 6

a virus....a lot of times is just a corrupt file...that was messed up somewhere along the line....an anti-virus can detect them because the search for anyhitng out of the norm.
a virus can be made by using a lot of code.....
Hope I helped!
~Brendon

Answer 7

yes it can be by using an anti virus program
it search all the computer to detect a virus

Answer 8

the in straight forward words thanks to substantiate that you're going to not in any respect see yet another piece of malware is to take the computing gadget off-line and not in any respect set up any new courses on it, not in any respect play any music or video clips on it... short of that, keep a good safe practices Suite put in, and dealing. in straight forward words ever pass on-line employing a restricted get admission to account, and in case you do favor to receive something employing your Admin account, do it from a depended on web site in straight forward words...then on the instantaneous log-off the internet, set up, and log-in back employing the restricted account. this would commonly reason something that does sneak by to evaporate once you log-off...and something that would not will be limted to that one account. As for finished prevention...there is not any such aspect.