What is the main cause of computer viruses?

A computer can get a virus through a number of ways, including:

• Email attachments

  Viruses can be spread through email attachments, which can be disguised as images, greeting cards, or audio and video files. You should never open an email attachment unless you know who sent it or you expect the attachment. 

• Websites

  Viruses can be spread through malicious or compromised websites. Malware can exploit vulnerabilities in your web browser to infect your computer. You can reduce your risk by keeping your software, especially your web browser, up to date. 

• Downloads

  Viruses can be hidden in pirated software or other files or programs you download. 

• Sharing files

  Viruses can be spread by sharing files, music, or photos with other users. 

• Software applications

  Viruses can be spread by installing software applications without reading the license agreements. 

To protect your computer from viruses, you can:

• Use strong, unique passwords that are at least 12 characters long

• Use a password manager to store your passwords securely

• Turn on multi-factor authentication for any accounts that support it

• Turn on automatic updates for your software, hardware, and apps

• Learn how to identify phishing attempts and don't fall for them 

Signs of a computer virus include: Slowdowns or lockups, Data theft, Unexpected shutdowns or restarts, Frequent error messages or pop-up windows, and Frequent system crashes.