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Viruses & worms

viruses & worms

Concerned about computer infections? We'll show you how to reduce your risk with antivirus software, firewalls, and more. Plus, get quick access to alerts and personalized help from other users like you.

 

 


What are viruses, worms, and Trojan horses?What are viruses, worms, and Trojan horses?

Every threat to your computer is unique. Read about the dangers so you can help protect yourself.

Why you should use a computer firewallWhy you should use a computer firewall

Learn why it’s beneficial to install a barrier of protection between your computer and the Internet.


Articles

Zombies and botnets: help keep your computer under your control

Frequently asked questions about antivirus software

Frequently asked questions about firewalls

How to secure your computer and home network

Protect your PC: Take the first 3 steps

Free security software

Download antivirus and firewall trials to help protect your computer.

Download software


Alert center

Critical: Sasser wormCritical: Sasser worm

Moderate: MydoomModerate: Mydoom

More security incidents

About virus alert ratings

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