Page 73 - Data Science class 10
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A virus can:
               • damage or delete your system files, application program files or data files.
               • may reformatting your computer’s hard drive.
               • slow down the performance of your computer.
               • computer programs and applications may behave unexpectedly.
               • steal  some important  and  confidential  information  like  your  name,  credit  card  details,  and  other  sensitive
              information kept on your computer and had over to unauthorised person.
            There are few a important things which a computer virus cannot do. They are:

               • It cannot infect files on CD-ROM as they are write-protected.
               • It cannot infect computer hardware such as monitors, keyboard, mouse, printer, etc.
            You can protect your computer from virus by following the given precautions:
               • Install and use anti-virus software.
               • Keep anti-virus software updated so that it can scan and remove new viruses.

               • Scan all the files that you download from the Internet.
               • Do not open e-mails from an unknown person/sender.
               • Don’t allow any untrustworthy person to use your system.
               • Never use unknown pen drive/CD on your computer.
               • Never click on the unknown windows that pop-up when you are surfing the Internet.





               The Creeper virus is the first computer virus  designed by Bob Thomas in 1971 as he conducted an experiment to
               develop a self-replicated program.


            3.13.1. Scanning and Cleaning Virus

            Scanning and cleaning a virus prevents any viruses from entering and will also clean any viruses that may have
            entered your computer system unknowingly. Install Anti-virus or anti malware software to keep your system safe.
            Anti-virus software is a program designed to prevent,detect and remove malicious programs from the computer.
            After  you  install the  anti-virus  software  runs  automatically in the  background  to  provide  real-time protection
            against virus attacks. You should also  run full system scans periodically. Some examples of anti-virus software are
            McAfee Virus Scan, Norton Anti-Virus, Microsoft Security essentials, Quick Heal, etc.
            Windows Defender is an antivirus software that's included in the Windows operating system that  protects your device
            from viruses and other malware and threats. To turn on the Windows defender in your computer do the following step:
            In Windows 10, click Start → Run, type Windows Defender, and press Enter.
            Some of the commonly used antivirus software are given below:











                      Quick Heal           Avira            McAfee            Norton                AVG





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