computer viruses

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Across
  1. 4. unwanted computer software installed on your
  2. 6. part of a computer system
  3. 7. a method of exchanging messages
Down
  1. 1. when someone tries to make a machine or network unavailable
  2. 2. a type of virus named after a greek myth
  3. 3. an email when someone attempts fraud
  4. 5. a virus that replicates itself