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What are viruses and how are they transmitted?

A virus is a malicious program intended to destroy data on your computer or crash specific software applications.

Viruses can be attached to email messages or pushed to your computer via interactive web sites.

Hackers also plant viruses if they manage to break into your computer. We recommend that you install anti-hacking (firewall) software on your computer to help prevent this.

More information:
How can I protect myself against viruses?