Computer viruses

Where do computer viruses come from?

• They occur when computers are not used properly.

• They are written by people with programming knowledge.

• They arise when computers are not manufactured correctly.

What do computer viruses do?

• They can make a computer user very sick.

• They can cause a computer to overheat.

• They can cause data on a computer to be deleted.

Computer viruses cannot ____ .

• delete files on a computer

• damage software on your computer

• destroy your computer's hard drive and other pieces of hardware

It is NOT possible to get a computer virus by __ .

• shutting down your computer improperly

• opening an e-mail message from someone you don't know

• visiting lots of new websites on the Internet

The number of existing computer viruses is closest to ____ .

• 1,000

• 1,000,000

• 1,000,000,000

The first computer virus spread through a Texas university in ___.

• 1968

• 1981

• 1995

Which is NOT a type of computer virus?

• a caterpillar

• a Trojan horse

• a worm