This Presentation Contain the Computer Antivirus Program

1. Computer Viruses
What You Need
to Know to
Protect Yourself

2. Types of Viruses
 File infectors
 Attach themselves to programs
 Boot-sector infectors
 Attach to the “boot sector” of a disk
Macro viruses
 Attach to documents and spreadsheets

3. Other Malicious Programs
 Trojan Horses
 You run the program on purpose, but it
does something more than you thought
Worms
 Like a virus, but spread via a network
without direct human intervention

4. How Much Damage?
 Benign Viruses
 Annoying, but not serious
 Malignant Viruses
 Cause great damage that may or may
not be repairable

5. Ways Viruses Spread
 Email attachments
 Shared files
 Floppy disks
 Infected documents and infected
word processors
Important: Viruses almost never spread
between operating systems such as Mac
and Windows!

6. Spreading a Virus
Jake
Aaron Becky Chad Danielle Eric
Friend
Friend Friend
Friend
Friend
Friend

7. Ways to Prevent Viruses
 Install a virus scanner
 Keep it updated
 Many are free
 Set it to run automatically
 A few examples
VirusScan
AntiVirus
F-Prot
InnoculateIT

8. Prevention (continued)
 Do not open email attachments you
were not expecting
 If downloading from internet, scan
with virus scanner before opening
 If you use Microsoft Word or Excel,
disable macros
 Keep your operating system and
programs up-to-date

9. Prevention (continued)
 Do not run random programs you
find on the internet
 Turn off scripting in your web
browser
 Disable auto-run features in email
programs

10. How Do I Know If I Have a
Virus?
 Virus checker gives a warning
 Strange messages appear
 Computer crashes more frequently
 Strange files you do not recognize start
appearing
 Files get bigger for no reason, or disk
space disappears for no reason
 Programs stop working normally

11. I Think I Have a Virus!
 Don’t panic!
 Stop using the computer
 Write down any strange messages
or warnings
 Do not reboot, open files, or run
programs
 Run your virus scanner
 Seek tech support help

12. Virus Warnings:
Real or Hoax?
 You receive a virus warning email
 Subject: “A Great Idea”
 Will ruin hard drive, sound cards, & speakers
 Lies dormant in BIOS, even after reformat -
reappears after reformat
 Antivirus webpages indicate no fix for
problem
 Please forward to as many people as you
can! A very dangerous virus!

13. Virus Warnings:
Real or Hoax?
Ask these common-sense questions:
 Did the warning come from a
trusted, knowledgeable source?
 Is there a link in the warning to a
site with more information?
 Is the virus listed on an antivirus or
hoax page?
 Does the warning make sense?