Viruses
In order for your computer to be infected by a virus, you must have downloaded the file which contains it.
To avoid downloading an infected file:
- Do not open attachments received from strangers.
- Install an up-to-date antivirus program that is automatically updated.
Worms
Worms travel without any help from users and lodge themselves in your computer's random access memory (RAM). Worms replicate and spread from computer to computer in the same network or to computers via e-mail. Worms usually send out copies of itself
to all the addresses in the infected computer's e-mail address book.
To keep your computer from being infected by a worm:
- Install an antivirus program and a firewall that are automatically updated.
Trojan horses
Trojan horses at first glance appear to be legitimate programs but do annoying or malicious damage to your computer. To be infected with a Trojan horse, the program must have been installed by the user. Beware of files that have two extensions, (e.g.,
photo-album.jpg.exe), which lead you to believe it includes photos but is actually an executable program (.exe).
To keep your computer from being infected by a Trojan horse:
- Do not open (click on a hyperlink) or run (double click on a file) you receive from strangers either by e-mail or in chat rooms.
- Beware of files with the following extensions: .exe, .bat, .com, .vbs, .pif. If a file looks suspicious, do not double click on it. If a suspicious file comes from someone you know, contact them to find out if it
was truly sent by them.
- Install an antivirus program and a firewall that are automatically updated.
- Configure your operating system not to open or run files automatically.
To find out more, see Protect your computer.