What is a virus?
A computer virus is a software program that attaches itself to other software programs on your computer. It can damage data files, display offending messages, cause your computer to crash, and also can overtake your email software and begin to send out vast amounts of email messages to your email contacts. Most viruses are obtained from either downloading files from the internet, opening attachments in email messages, or from visiting websites on the World Wide Web.

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1. What is a virus?
2. How do I know a virus or spyware has infected my computer?
3. How do I avoid being infected with viruses and spyware?