Anti Virus Software is one of the main defences against online problems. It continually scans for viruses, including Trojans and worms. To be effective it must be kept up to date.

Without anti-virus software you are very vulnerable to computer viruses, including Infected emails/Drive-by infections from corrupt websites/Worms/Spyware

• Identity theft
• Fraud
• Loss of data
• Slow or unusable computer
  
  

Virus protection advice

• Do not open any files attached to an email from unknown sources
• Switch on macro protection in MS Office
• Keep anti-virus software up to date

What is a computer virus?

A computer virus is a program that invades your computer system, hides there, and makes copies of (replicates) itself. Viruses spread when you launch an infected application or start up your computer from a disk that has infected system files.

Viruses behave in different ways. Some viruses stay active in memory until you turn off your computer. Other viruses stay active only as long as the infected applications is running. Turning off your computer or exiting the application removes the virus from memory, but does not remove the virus from the infected file or disk.

Some viruses are programmed specifically to damage the data on your computer by corrupting programs, deleting files, or erasing your entire hard disk.

All computer viruses are manmade. A simple virus that can make a copy of itself over and over again is relatively easy to produce. Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt.

Trojan horses are not viruses; however, they are often thought of as viruses. A trojan horse is a program that appears to serve some useful purpose or provide entertainment, which encourages you to run it. But, like the Trojan horse of old, it also serves a covert purpose which may be to damage files or perhaps plant a virus on your computer.