Tuesday, December 8, 2009

List Of Antivirus Software





AOL Active Virus Shield (discontinued)
Avast! Home Edition
Avast! Professional Edition
AVG Anti-Virus
AVG Anti-Virus Free
Avira AntiVir Personal
Avira AntiVir Premium
AVZ (Russian)
BitDefender
BitDefender Free Edition
BullGuard
CA Anti-Virus
Clam AntiVirus
ClamWin Yes
Comodo AntiVirus
Dr. Web
Dr. Web CureIt
F-Prot
F-Secure
Fortinet FortiClient End Point Security
G DATA Software
Graugon AntiVirus
Intego VirusBarrier X5
Kaspersky Anti-Virus
McAfee VirusScan
Microsoft Security Essentials
ESET NOD32
Norman
Panda Antivirus
Panda Cloud Antivirus
PC Tools AntiVirus
PC Tools AntiVirus Free Edition
Quick Heal AntiVirus
Sophos Anti-Virus
Symantec Norton AntiVirus/Norton 360
Trend Micro Internet Security
Vba32Antivirus
Sunbelt Software VIPRE Antivirus + Antispyware
VirusBuster
ZoneAlarm Antivirus

How To Protect Computer From Virus ?



Antivirus (or anti-virus) software is used to prevent, detect, and remove malware, including computer viruses, worms, and trojan horses. Such programs may also prevent and remove adware, spyware, and other forms of malware.

A variety of strategies are typically employed. Signature-based detection involves searching for known malicious patterns in executable code. However, it is possible for a user to be infected with new malware in which no signature exists yet. To counter such so-called zero-day threats, heuristics can be used. One type of heuristic approach, generic signatures, can identify new viruses or variants of existing viruses by looking for known malicious code (or slight variations of such code) in files. Some antivirus software can also predict what a file will do if opened/run by emulating it in a sandbox and analyzing what it does to see if it performs any malicious actions. If it does, this could mean the file is malicious.

However, no matter how useful antivirus software is, it can sometimes have drawbacks. Antivirus software can degrade computer performance if it is not designed efficiently. Inexperienced users may have trouble understanding the prompts and decisions that antivirus software presents them with. An incorrect decision may lead to a security breach. If the antivirus software employs heuristic detection (of any kind), success depends on achieving the right balance between false positives and false negatives. False positives can be as destructive as false negatives. In one case, a faulty virus signature issued by Symantec mistakenly removed essential operating system files, leaving thousands of PCs unable to boot. Finally, antivirus software generally runs at the highly trusted kernel level of the operating system, creating a potential avenue of attack.

What Is A Computer Virus ?



A computer virus is a computer program that can copy itself and infect a computer. 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.

The term "computer virus" is sometimes used as a catch-all phrase to include all types of malware. Malware includes computer viruses, worms, trojans, most rootkits, spyware, dishonest adware, crimeware, and other malicious and unwanted software, including true viruses. Viruses are sometimes confused with computer worms and Trojan horses, which are technically different. A worm can exploit security vulnerabilities to spread itself to other computers without needing to be transferred as part of a host, and a Trojan horse is a program that appears harmless but has a hidden agenda. Worms and Trojans, like viruses, may cause harm to either a computer system's hosted data, functional performance, or networking throughput, when they are executed. Some viruses and other malware have symptoms noticeable to the computer user, but many are surreptitious or go unnoticed.

List Of Computer Companies


Computer/List of computer companies :



3Com Corporation
3Dlabs
ADC Telecommunications
ADInstruments
AIM alliance
ASRock
AST Computers, LLC
AST Research, Inc.
ASUS
ATI Technologies
Acer (company)
Albatron
Alienware
Alliant Computer Systems
Amdahl Corporation
American Megatrends Incorporated
Amiga Corporation
Anoto Service Provider
Antec
Applied Materials
Arctic Cooling
Bacoc
Be Inc.
Belkin
BenQ
Brother Industries, Ltd.
Groupe Bull
CAD-UL
Centronics
Certance
Cirque Corporation
Cirrus Logic
Cisco Systems
Clevo
Commodore International
Compaq
Conexant
Corsair Memory
Cradle Technologies
Cray Inc.
Creative Micro Designs
Crescendo Networks
D-Link
Dell, Inc.
Digi International
Digium
EMachines
EMagin
Eizo
Encore Computer
Endace
Enterasys Networks
Expand Networks
F5 Networks
Falcon Northwest
Foxconn
Franklin Electronic Publishers
Fujitsu
Fujitsu Siemens Computers
GEIL
GENICOM
General Magic
Gigabyte Technology
Group Sense PDA
Hercules Computer Technology, Inc.
High Tech Computer Corporation
IP Unity
Intel
Kaypro
Kensington Technology Group
LaCie
Lenovo Group
Lexmark
Linksys
Matrox
Maxtor Corporation
Micro-Star International
Motion Computing
NEC Corporation
NVIDIA
NeXT
Netgear
Norsk Data
Nortel
Oak Technology
PNY Technologies
Packard Bell
Papst
Plextor
PowerVR
Pyramid Technology
Quantel
Quantum Corporation
Quinta
Riverbed Technology
S3 Graphics
SAGE Computer Technology
Sandial Systems
Sandvine
SavRow
Sea Sonic
Seagate Technology
Semiconductor Manufacturing International Corporation
Sequent Computer Systems
Shuttle Inc.
Silicon Graphics
Silicon Integrated Systems
Sirius Systems Technology
SofaWare Technologies
Strangeloop Networks
Synaptics
Synthesys
Targus (corporation)
Technical Solutions, Inc.
Thermalright
Thermaltake
Tiki Data
Transcend
Trident Microsystems
Tseng Labs
Tulip Computers
Unicomp
Universal abit
VIA Technologies
VTech
ViewSonic
Western Digital
WidowPC
Zalman

What Are The Types Of Computers ?




Microcomputers are the most common type of computers in existence today, whether at work in school or on the desk at home. The term "microcomputer" was introduced with the advent of single chip microprocessors. The term "microcomputer" itself, is now practically an anachronism.

These computers include:

Desktop computers

Laptop and notebook computers

Tablet PC

Palmtop computers

Personal digital assistants (PDA)

Programmable calculator

Why Do We Need A Computer ?


The present global age is the consequence of the computer age. A computer is an electronic device that stores and processes data, according to a list of instructions. It allows a user to manipulate data easily. The speed of performance of a computer is incomparable. The computer and Internet have affected our way of working, communicating, playing and also writing. In fact, computers are used in every aspect of life today.

Advantages of Computers

Because of the many advantages of a computer, it has become an important household item. A computer operated by an individual without any specific computer operator is called as a personal computer (PC). A PC can be a desktop or a laptop computer and can be used at home or at office. As per the requirement of the user, softwares are installed in a PC. Let’s discuss the advantages of computers.

One can write more effectively by means of a computer. There are tools like spelling and grammar checker, thesaurus and dictionary, installed in the computer. Thus, it takes less time to proofread a written document and also, there is no need to open up a dictionary book to look for meanings of words. Typing is much faster than writing on a paper. If there is a need for reorganizing the sentences or paragraphs, one can cut and paste and make the necessary changes. Thus, overall a computer allows the user to create documents, edit, print, and store them so that they can be retrieved later.

Using a computer, one can remain connected to the world through Internet. Internet is a network of computers that communicates via the Internet Protocol Suite (TCP/IP). The World Wide Web (WWW) or simply web is a huge resource of information that can be accessed via the Internet. To mention a few of the resources, there are electronic mail (e-mail), file transferring and sharing, online chat and gaming. The Internet allows people from around the world to share knowledge, ideas and experiences in any field.

E-mail is a method of communication used globally and is provided with a system of creating, storing and forwarding mails. It may consist of text messages with attachments of audio-visual clips. One can also download or upload files using the Internet. There are also facilities like online chatting available on the Internet. As compared to telephonic conversation, both e-mail and online chat are cost saving. Online gaming is another important resource of the WWW. Many online games are available, which are of common interest for any age group. In addition, one can read current news, check weather conditions, plan vacations and make hotel and travel reservations, find out about diseases and treatment methods, conduct transactions, learn about specific countries and their cultures, seek jobs, buy products, etc via the Internet.

Nowadays, computers are widely used for education and training purposes. In schools, computer education has been made compulsory to spread awareness about computers. As a matter of fact, computers have become a learning tool for children. Also, there are many universities that provide online degrees, which is very advantageous for those people staying in the remote areas and for the disabled. In fact, online education is one of the most flexible and convenient forms of learning. One can take the benefit of such online degree programs staying at home without the need of relocation. Computers are also used for training purposes. Many companies use them to train their staffs.

However, in spite of the many advantages of computers, there are some disadvantages that cannot be ignored. The easy access to information via Internet has made students lazy in terms of their education since they are able to download information without exploring their topic of research. They also use computers for mathematical tables and calculations without actually solving the problems. Also, it is important for parents to keep a check on the browsing habits of their children as some websites are not meant for their viewing. Other disadvantages include identity theft and virus threat. Computers viruses are harmful to the systems and can be transferred from one computer system to another.

What Is A Computer ?



When you mention the word "technology," most people think about computers. Virtually every facet of our lives has some computerized component. The appliances in our homes have microprocessors built into them, as do our televisions. Even our cars have computers. But the computer that everyone thinks of first is typically the personal computer, or PC. 

A PC is a general-purpose tool built around a microprocessor. It has lots of different parts -- including memory, a hard disk, a modem, and more -- that work together. "General purpose" means that you can do many different things with a PC. You can use it to type documents, send e-mail, browse the Internet and play games.                             

PCs trace their history back to the 1970s, when a man named Ed Roberts began to sell computer kits based on a microprocessor chip designed by Intel. Roberts called his computer the Altair 8800 and sold the unassembled kits for $395. Popular Electronics ran a story about the kid in its January 1975 issue, and to the surprise of just about everyone, the kits became an instant hit and the era of the personal computer began [source: The Computer History Project].

A few years later, the dynamic duo of Steve Jobs and Steve Wozniak unleashed the Apple II computer on the world. From that point on, the personal computer really began to take off. Other manufacturers followed suit, and soon there were computers from Commodore, Atari and Texas Instruments. Not long after the debut of the Apple II, IBM got into the personal computer game.

Today, when someone says PC, chances are they mean a machine running on the Microsoft Windows operating system with an x86-compatible microprocessor. While Apple Macintosh computers are technically personal computers, most people wouldn't call them PCs.

In this article, we will talk about PCs in the general sense and all the different parts that go into them. You'll learn about the various components and how they work together in a basic operating session. You'll also find out what the future may hold for these machines.