Antivirus is the most important part in the computer. Antivirus various was paid or not. Various antivirus that exist in the world such as kaspersky antivirus, avg antivirus, avira antivirus, avast antivirus, ESET NOD32 antivirus and so many. Antivirus is used to protect your computer from virus attacks when we play online games, surf the internet, insert the flashdisk into the computer. At this time the amount of virus in the world more than 100,000 viruses. For that antivirus is very important for your computer. Various viruses such as trojan horses, worms, bootsector viruses, macro viruses, memory resident viruses, rootkit viruses, polymorphic viruses and logic bombs / time bombs. Virus itself can cause the computer can't move, can absorb the personal computer in the form of media and bank account, but the antivirus was made ​​for the good and the interests of the bad. Made in bad side means the person making the work as a hacker makes antivirus it for their own interests. While antivirus made ​​for either side made ​​by the official vendor.

Antivirus used in office and home. In Indonesia, the most popular antivirus isn't effective. The reason, because any new virus not detected in the antivirus. Antivirus make the computer safe from virus computer.

Kaspersky is founded by Natalia Kaspersky and Eugene Kaspersky in 1997. Any appreciation has get to this antivirus. Kaspersky is the best antivirus in the world. Any virus who want to break the system always failed,but the price is high.

Virus is start from hacker. The virus can infected computer to computer, because connection from internet.

The Hacker used virus to hack government system and intelligence system like (FBI, CIA). Virus describe a spy in computer. Virus apart the algotyhrm in computer and hack it separate. 

There is any top hacker in the world :

1. Jonathan James

James is an American, when new 16 years he be sent to prison because of his conduct virtual world. U.S. defense department website compromised by the James and he just said it was a challenge for him and a pleasure ..

NASA also got her fad, James steal NASA software is estimated to cost $ 1.7 million dollars. to the extent that NASA was forced to shut down the server and the system.

Because she has not behaved well be holding a computer for 10 years.

but now she's already on the path of Ko and makes a company in the field of computer security.

2. Adrian Lamo 

He break New York Times system for getting personal information and some security number and break Microsoft. He was eventually fined $ 65,000 U.S. dollars.

3. Kevin Mitnick

The events that have been done him:

* Using the Los Angeles bus transfer system to get a ride for free

* Trick the FBI

* Hacking into DEC system (Digital Equipment Corporation)

* Get administrator position in an IBM computer let me win at gambling, because the admin who has the IBM laptop

* Hacking Motorola, NEC, Nokia, Sun Microsystems and Fujitsu Siemens systems

And many more behaviors outstanding

A white hat hacker by the name of Tsutomu Shimomura was (and is also an expert top 5 white hat hackers) hacked the computer systems in, and there was a remarkable war ..

He was caught and track by Tsutomu Shimomura FBI with the help of a tracking (tracking) through HP's network carried by Mitnick time ..

But now he repent and become an author, security consultant, and speaker.

4. Kevin Poulsen

Also known as Dark Dante, he hack into the FBI database

In addition he also hack around the station phone lines. Because proficiency him hack through the phone lines.

Currently, he is a senior editor at Wired News, and successfully know 744 offers sex through Myspace profiles.

5. Robert Tappan Moris

Ni is the person who first make a worm, named after the Morris Worm.

Through the internet he spread worm virus resulting in approximately 6000 computers so down.

He was eventually jailed house for 3 years and fined $ 10,500 dollars

Now he is working as a professor at the MIT Computer Science and Artificial Intelligence Laboratory

In 1940s-1950s, computer used vacum tubes and they were huge and complex. The first general purpose electronic was ENIAC(Electronic Numerical Integrator and Computer). This first generation computer used digital , didn't operate with binary code and was reprogrammable to solve a complete range of computing problems.It was programmed using plugboards and switches, supporting input from an IBM card reader, and output to an IBM card punch. It took up 167 square meters, weighed 27 tons, and consuming 150 kilowatts of power. It used thousands of vacuum tubes, crystal diodes, relays, resistors, and capacitors.

Here is the picture about the first computer with many vacum tubes and cabel.

A computer is a programmable machine,This means it can killed a programmed list of instructions and respond to new instructions that it is given. Today, however, the term is most often used to refer to the desktop and laptop computers that most people use. When referring to a desktop model, the term "computer" only refers to the computer itself not the monitor, keyboard, and mouse. Still, it is acceptable to refer to everything together as the computer. If you want to be really technical, the box that holds the computer is called the "system unit."

Some of the major parts of a personal computer(or PC) include the motherboard, CPU, memory (or RAM), hard drive, and video card. While personal computers are by far the most common type of computers today, there are several other types of computers. For example, a minicomputer is a powerful computer that can support many users at once. A mainframe is a large, high-powered computer that can perform billions of calculations from multiple sources at one time. A supercomputer is a machine that can process billions of instructions a second and is used to calculate extremely complex calculations.