Computer virus, Remedy and Protection

  Computer Virus  software

A computer is a program or small code of segment. Which is written with a malicious intent. It has the capacity to attach itself to existing programs or file and infect them as well as replicate itself without the user's knowledge or permission.
It entire into the compute system from external source like CD, pen drive or e-mail and executes
when an infected program is executed. Further , as an infected computer gets in content with an uninfected computer ( e.g. through computer networks). virus may pass on to the uninfected system and destroy the files.
Effect of Viruses:
Some ill-effect that can be caused by viruses are as follows:

• Corrupting the data
• Increasing the file size
• Formatting the hard disk
• Slowing down the system
• Manipulating the directory contents
• Renaming all files with different names


Symptoms of virus Infection:
There are many different types of computer viruses . Recognizing the symptoms of virus can be difficult task because every day a number of computer viruses spread in the world with the changing behavior of infections.
The symptoms of computer virus are:

• Sometimes computer may not boot and hang quickly.
• Viruses show error message on the screen.
• Unwanted message, figure and picture can be seen on the screen.
• It takes long time to load the program.
• It  changes the sizes of an executable file.
• It shows down the computer.
• It reduces the memory of computer.
• It corrupts the system data.
• It renames the file with different names.
• It increase the use of disk space and growth in file size.


Remedy of viruses:
Different organizations have different styles of operations. This fact extends to the way they set up their computer networks and operating procedures. If computer operations consists of one or two personal computers used by fewer people, then they need for an elaborate defense system is not utmost importance. However, if the system is large enough to include the worldwide networks used by large corporations, then a detailed and systematic defense is required.
Safety from virus infections:
Virus create several problems for the users and sometimes they may irritate the computer user in different ways.
Following are the precautions that have to take to avoid virus infection.

• Do not pirated software.
• Install and upgrade regular antivirus software.
• Write protect your floppy disk when using them on the computer.
• Scan the mail and unknown file of Internet before opening in your computer.
• Do not use unless the virus is totally removed from the infected computer.
• Backup your system on regular basis.
• Lock the computer when not is use.
• Use the user password system to avoid unauthorized use of the computer.
• Check the news software for virus before installing it.
• Check the diskette of other person for virus before using it.'


Antivirus:
Antivirus is a software utility, which upon installing on a computer, scan the hard disk for viruses and tries to remove them, if found . Most antivirus programs includes an auto-update feature that enables the programs to download profiles of new viruses so that it can check for the various as soon they are discovered. The most popular antivirus software include:
AVG McAfee
Scan utility Norton Anti-virus
PC-Collin Pena Antivirus
NOD 32 Kaspersky
Symantec         K7

Some of the antivirus logo are given below: