A virus in a computer is a program that can copy itself and infect a computer without the permission or knowledge of the user. Viruses can cause a computer to crash, or can be used to steal information or spam email addresses.

Viruses are often spread through email attachments, or by downloading infected files from the internet. They can also be spread through USB drives, or other external storage devices.

Some common symptoms of a virus infection include unusual system behaviour, crashing, or the appearance of strange or unexpected files or folders on the computer.

There are a number of …