1. COMPUTER APPLICATION Assignment Work on Microsoft PowerPoint 2010 on the topic Submitted by, QURAT UL AIN NAEEM Department, Education, UOK

2. What Is 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. 3. These viruses infect disc boot records or master boot records in hard disks. They replace the boot record program, copying it elsewhere on the disk or overwriting it. Boot viruses load into memory if the computer tries to read the disk while it is booting. Examples: Form, Disk Killer, Michelangelo, and Stone virus These infect executable program files, such as those with extensions like .BIN, .COM, .EXE, .OVL, .DRV (driver) and .SYS (device driver). These programs are loaded in memory during execution, taking the virus with them. The virus becomes active in memory, making copies of itself and infecting files on disk. Examples: Sunday, Cascade Types Of Viruses Boot viruses Program viruses 4. Multipartite viruses They infect program files and when the infected program is executed, these viruses infect the boot record. When you boot the computer next time the virus from the boot record loads in memory and then starts infecting other program files on disk. Examples: Invader, Flip, Tequila Macro viruses Active x virusesIt is a new type of computer virus that infects the macros within a document or template. When you open a word processing or spreadsheet document, the macro virus is activated and it infects the Normal template (Normal.dot)-a general purpose file that stores default document formatting settings. Examples: DMV, Nuclear, Word Concept. ActiveX and Java controls will soon be the scourge of computing. Most people do not know how to control there web browser to enable or disable the various functions like playing sound or video and so, by default, leave a nice big hole in the security by allowing applets free run into there machine. 5. How Do Computer Viruses Spread? Computer viruses usually spread in one of the three ways 6. E-mail Virus.. Removable Disc How To Remove A Computer Virus Install and Update the antivirus software on the computer. Then, perform a thorough scan of the computer by using the antivirus software. Install the latest updates from Microsoft Update on the computer. Download, install, and then run the Malicious Software Removal Tool to remove existing viruses on the computer. To download the Malicious software removal too. 7. How To Scan A Computer For Viruses..!!! 8. How To Protect Your Computer Against Viruses On the computer, turn on the firewall Keep the computer operating system up to date Use updated antivirus software on the computer 9. Conclusion..!!