Home
About Us
News
Product Center
.Travel
Forum
Contact Us
Online Support
Clients
Virus -- 2008-11-25

A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. The term "virus" is also commonly used, albeit erroneously, to refer to many different types of malware and adware programs. The original virus may modify the copies, or the copies may modify themselves, as occurs in a metamorphic virus. A virus can only spread from one computer to another when its host is taken to the uninfected computer, for instance by a user sending it over a network or the Internet, or by carrying it on a removable medium such as a floppy disk, CD, or USB drive. Meanwhile viruses can spread to other computers by infecting files on a network file systemcomputer worms and Trojan horses. A worm can spread itself to other computers without needing to be transferred as part of a host, and a Trojan horse is a file that appears harmless. Worms and Trojans may cause harm to either a computer system's hosted data, functional performance, or networking throughput, when executed. In general, a worm does not actually harm either the system's hardware or software, while at least in theory, a Trojan's payload may be capable of almost any type of harm if executed. Some can't be seen when the program is not running, but as soon as the infected code is run, the Trojan horse kicks in. That is why it is so hard for people to find viruses and other malware themselves and why they have to use spyware programs and registry processors. or a file system that is accessed by another computer. Viruses are sometimes confused with

Most personal computers are now connected to the Internet and to local area networks, facilitating the spread of malicious code. Today's viruses may also take advantage of network services such as the World Wide Web, e-mail, Instant Messaging and file sharingmalware. systems to spread, blurring the line between viruses and worms. Furthermore, some sources use an alternative terminology in which a virus is any form of self-replicating

Some malware is programmed to damage the computer by damaging programs, deleting files, or reformatting the hard disk. Other malware programs are not designed to do any damage, but simply replicate themselves and perhaps make their presence known by presenting text, video, or audio messages. Even these less sinister malware programs can create problems for the computer user. They typically take up computer memory used by legitimate programs. As a result, they often cause erratic behavior and can result in system crashes. In addition, much malware is bug-ridden, and these bugs may lead to system crashes and data loss. Many CiD programs are programs that have been downloaded by the user and pop up every so often. This results in slowing down of the computer, but it is also very difficult to find and stop the problem.

Source : Wikipedia
Comment
Article Keywords
Personal ComputerPCAnti virusVirusWeb BrowserOperating SystemE-mailE-mailOutlookOutlook ExpressHacker
Article Relative Hazards
Safety audit 安全審核 安全审核 Safety consultancy 安全顧問 安全顾问 Safety consultant 安全顧問 安全顾问 Safety consulting 安全顧問 安全顾问 Safety management system 安全管理制度/系統 安全管理制度/系统 china tour china culture tour china culture hotel 文化酒店 文化酒店 中國文化酒店 中国文化酒店 四合院酒店 四合院酒店 文化旅行團 文化旅行团 文化旅遊 文化旅游 特色旅遊 特色旅游 China culture Tour 中國文化旅遊 中国文化旅游 China culture travel culture travel Package safety audit $2,900 up 安全審核 $2,900 起 安全审核 $2,900 起 Ancient Silk Road Culture 絲綢之路 文化 絲路文化 丝绸之路 文化 丝路文化 Silk Road Tour Silk Road Travel 絲路旅遊 絲路旅行 丝路旅游 丝路旅行 Chinese culture tour Chinese cultural tour Chinese culture travel Chinese cultural travel 西藏文化 西藏文化 Tibetan Buddhism Culture 絲綢之路 丝绸之路 Ancient SIlk Road Culture 文化酒店套票推介 文化酒店套票推介 Culture Hotels Packages Hot Deals