13-06-2012, 12:57 PM
VIRUSES AND Anti-viru-ses
antivirus 6 sem.pptx (Size: 2.38 MB / Downloads: 31)
WHAT IS A COMPUTER VIRUS?
A computer virus is a small software program that spreads from one computer to another computer and that interferes with computer operation. A computer virus may corrupt or delete data on a computer, use an e-mail program to spread the virus to other computers, or even delete everything on the hard disk.
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CHARACTERISTICS OF A COMPUTER VIRUS:
the ability to replicate itself.
the ability to attach itself to another computer file.
WORKING OF COMPUTER VIRUS
A Computer Virus needs another program in order to be able to be activated and infect other computers files.
For example, a virus might attach itself to a spreadsheet program. Each time the program runs, the virus runs too.
A file containing virus is called infected file.
WHAT CAN VIRUSES DO?
Format hard disk
Copy, rename and delete files
Modify files dates and extensions
Display false message every few times
Damage data
Damage software
What do you mean by anti-viruses ?
“Antivirus" is protective software designed to defend your computer against malicious software.
In order to be an effective defense, the antivirus software needs to run in the background at all times, and should be kept updated so it recognizes new versions of malicious software.