2. What is a computer virus?
Common symptoms - Do I have a virus?
How to protect your computer from viruses?
How to get rid of the virus?
Antivirus & firewall
Bibliography

3. • A SPY?
• A computer virus is a small program that spreads
from one computer to another and disturbs with the
operation of your computer.
• A computer virus may damage or delete files and
data from your computer or even destroy the whole
hard drive.
• Computer viruses spread easily through e-mail
attachments or via e-mail chats.

4. • Computer viruses can “mask” with attached
pictures, cards, or video files.
• Viruses can spread through downloads from the
Internet.
• All computer viruses are man-made.
• Malicious software's are for example:
viruses, Trojans, adware and spyware.
• (A Trojan is a program that pretends to be something
it isn’t.)

5. Your computer keeps restarting when you try to shut it
down.
Computer is running slower than usual.
Computer stops responding.
Computer freezes frequently.
Computer folders & files are removed or changed.
Computer crashes and then restarts every few minutes.
Applications on the computer do not work correctly.
Disks or disk drives can not be used.
You receive an unusual error messages.
The computer can not install anti-virus software or anti-
virus program does not start.

6. • Turn on the firewall.
• Always have an up-to-date antivirus
software in your computer.
• Do not open & download suspicious e-
mails or attachments
• Change pop-up blockers to the highest
security setting.
• Surf safely: only use trusted web-sites.
• Keep your Internet browser up-to-date.
• Run defragmentation (A process you
run on a hard drive to help make it
faster).

7. • Can be difficult, some viruses can re-install themselves
even after the virus have been removed. But here´s few
tips:
• Close the computer, remove it from the network and re-
start it. This should stop the virus to spread in internal
memory.
• Immediately after re-starting the computer, it´s good to
run an anti-virus software. An up-to-date programme
usually knows how to remove viruses.
• Re-install the windows: download the latest version of
your Internet browser.
• Format the hard drive. This action will delete all data, files
and programmes from your computer. But at the same

8. Anti-virus protects your computer from
viruses.
The firewall prevents hackers from
accessing your computer.

9. • http://support.microsoft.com/kb/129972/fi
• http://www.ehow.com/how_4903119_identify-
computer-virus-symptoms.html
• http://techtips.salon.com/rid-computer-viruses-
popups-11941.html
• http://www.bbc.co.uk/webwise/guides/virus-
protection
• http://www.cibernarium.tamk.fi/tietoturva2/virus_pois
to_2.htm