Is your computer slow? It will not open the program and not in the what to get? Well, maybe you have a sick computer. As the person with the virus, as well as computer sick. When this happens, you need to see format a computer technician at the computer and get rid of the virus. If you know anything about computers, you can probably do it yourself.
What is a virus?
The virus is a parasitic program written to intentionally enter a computer without user intervention, permission or knowledge. The parasite words are used because a virus to files or boot sectors and replicates itself, which allows it to spread. Though some viruses do little more than copy themselves, others can cause serious damage or affect program and system performance. Viruses are not harmless and left on a system.
Nature of the virus
Viruses are classified by how they infect computer systems:
1) Program. Executable files with the extensions like COM, EXE, OVL, DRV, Sys am …..
2) Boot: Boot Record, Master Boot, FAT and Partition Table.
3) Multipartite: Both program and start infector.
What is a Trojan horse?
In addition to a large wooden horse used in the Trojan war 2500 years ago (and recently by Brad Pitt) is Trojan or Trojan horse is a computer program that does not seem dangerous or not dangerous blind, but the other features are even worse. Trojans are usually contained in a part of the program, was placed in your computer from external sources – (eg floppy disks, CDs, Internet downloads, e-mail infected). Trojans can be dangerous sometimes. For example, the program seems a demo computer game, but if you can enjoy the game like your hard disk reformat porn sites or emails to everyone in address book.
Trojans are also known as “back door” or “trap door” into the computer’s operating system uses information creep. Examples of programs that claim to be a system to Log-in programs (as you find on the Windows NT / XP or Linux). When it tries an unsuspecting user to log in, Trojans capture the user name & password. So maybe not demonstrate login attempts and the actual log-in program. The user can successfully log into the system the next time, but have at this moment Trojans also detailed enough to log into the system.
Example Trojans
Notroj. This Trojan pretends to be a program that protects against Trojans. This is actually a time bomb that wipes the hard disks full after more than 70 percent.
PWSteal.Refest a Trojan horse that installs itself as a BHO (Browser Helper Object) for Internet Explorer and steals online banking information when presented in a web form.
PWSteal.Likmet.AA Trojan horse that displays a fake MSN Messenger application window and stealing the password provided.
Run.me. This is a graphics program, the Star Spangled Banner played and display the American flag, while deleting the worm way into your hard drive and data on it.
What is a worm?
A worm is a program that propagates itself by working through the system or network (such as the Internet), often causing damage. You need to activate a host program. Someone must be directly in the computer network connected to each other worms, which can receive messages from one to the other files and programs to exchange data and should be sent. Examples include local network in which each computer has its own files, programs and operating systems such as hard disk in a university or corporate network settings are found.
Example Worms
Alarm Clock Worm. A worm, which stretches out over the network to the terminal (one equipped with a modem) and a wake-up call to the user list.
Worm Watcher. A special program that automatically takes steps to reduce the size of the worm, or turn it off, grow beyond a certain limit. Analysts also keep a change log worm flying visit to