to other computers. Most viruses have a destructive payload that is activated under certain conditions.
Malware - malicious software designed to infiltrate or damage a computer without the owner's informed consent.
The expression is a general term used by computer professionals to mean a variety of forms of hostile, intrusive or
annoying software or program code. The term "computer virus" is sometimes used as a catch-all phrase to include
all types of malware, including true viruses. (from Wikipedia)
Virus Defined
How does a virus work?  (opening ad?)
White Papers
Computer Virus Encyclopedia  (Malware explained in detail by Kaspersky Labs)
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How does a virus work?  (opening ad?)
White Papers
Computer Virus Encyclopedia  (Malware explained in detail by Kaspersky Labs)
AVG
License InfoHome Page
Free Download
Definition Updates  (recommended to update directly from AVG app)
Paid Versions
Review   (Download.com)
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Avast!
License InfoHome Page
Free Download
Definition Updates  (recommended to update directly from Avast! app)
Paid Version
Review   (PC Mag)
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AntiVir
License InfoHome Page
Free Download
Definition Updates
Other Products  (server versions, business bundles, etc)
Support  (Forum, FAQ, documentation, etc)
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ThreatFire   (Real-time behavior-based malware protection)
License: FREE for personal home use! (Business users must purchase ThreatFire Pro.)Home Page
Downloads  (Vendor, FREE and paid versions)
Free Download  (Download.com)
Product Updates  (recommended to use Smart Update directly from ThreatFire app)
Definition Updates?  (Behavior-based, not signature-based; no definition updates needed!)
Review   (PC Mag)
Forum
FAQ
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MS Security Essentials
LicenseHome Page
Info
Support
Malware Protection Center
Free MS security tools
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Trend Micro HouseCall   (Free online anti-virus scan)
Commercial AV Definition Updates
KasperskyMcAfee
Symantec (Norton)
Trend Micro