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Computer virus and antivirus


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  • 1. Computer Virus and Antivirus
  • 2. Types of Computer Viruses
  • 3. Types of Computer Viruses• Boot Viruses – Copies the virus code in the boot sector of the disk, this ensures that the virus is always executed and loaded in the memory when the system starts• Polymorphic Viruses – Infects the system and change its signature before infecting the next system• Macro Viruses – A macro having the virus code is executed, it infects the files on the system• Worms – Programs that replicate and spread to other systems and reside in system memory and affects e- mail system
  • 4. Types of Computer Viruses• Trojans – Program file that claims to do something but does something that is not required. Allows remote users and hackers to gain unauthorized access to your system• Spywares – Stores personal information and surfing details and send them to its web site without informing the user. Many spywares get installed automatically as a free download while installing an application
  • 5. SpywareThe following problems indicate that a spyware or other unwanted software is installedon your computer:• Unwanted advertisements pop-up even when not connected to the Web• Web browser settings are changed automatically• Unable to remove unwanted toolbar from the browser• Computer performance slows down• Computer crashes very frequentlySpywares can be removed from the system by installing some kind of anti-spyware program. The user can also use software tools are available from McAfee, Ad-Aware and Symantec
  • 6. Installing Antivirus Software and show how to install• Install an antivirus software to protect PC from viruses• Software such as Panda AntiVirus, Norton AntiVirus, or PC-cillin can be used• Check the reliability and the features offered by AntiVirus software before installing it on the system• Install Norton Antivirus 2006 software from the CD to protect the system
  • 7. Working with Antivirus Software – I and show how to configure• Norton Antivirus 2006 software protects and scans your system for viruses• Scans Web pages displayed in the browser• Cleans viruses in incoming and outgoing mails• Removes spyware software that slows down the system
  • 8. Working with Antivirus Software• Configuring – Enables to set the level of protection – Higher level of protection increase system security• Using Live Updates – Connects to the Web server, downloads and updates files required to identify and delete latest viruses
  • 9. Working with Antivirus Software• Manual Update of AntiVirus – Virus definitions are available for download from the Website• Scanning Drives – Checks the system for virus infected files – Software enables to select the drives, folders, or files to scan• Using a Fix Tool – Used to alter damage done by viruses – Some files may not be recoverable even after running the Fix Tool
  • 10. Preventing Virus Attacks• Viruses can cause damage to your system• AntiVirus software protects your system from viruses• Protect your system by preventing the viruses from getting into your system