It's important to protect your computer against computer viruses. A computer virus is a program that is designed to cause havoc on your computer. Viruses are often spread from one computer to another in email messages, but that's certainly not the only way to catch a virus.
Different viruses cause different problems.
They can include anything from deleting files on your computer through to preventing your computer from starting. To protect your own computer and prevent the spread of viruses there are several steps you should take. Protect your computer from from viruses Always be wary of email messages sent to you by people you don't know. Especially messages with attachments. However, don't assume because the email sender is someone you do know that their message is safe.