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Ways a virus can enter a system

What are all the ways a virus can enter our system?
Here are the ways malware (viruses, worms, Trojans, spyware, etc.) can infect computer systems -- I think this is what you're looking for. This list will likely grow over time.
  • E-mail attachments
  • Self-propagating via the Internet infecting Web servers, etc.
  • Spam
  • Infected Web pages that users load
  • PDAs
  • DVDs, CDs, floppies, hard drives, USB drives and other media
  • Infected programs that users believe are legitimate programs (games, screen savers, utilities, etc.)

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