computer system maintenance

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Across
  1. 3. the cause of a computer problem (8 letters)
  2. 4. a system function at its best (8 letters)
  3. 7. dust and debris from hardware (7 letters)
  4. 9. components like the CPU and RAM (8 letters)
  5. 11. fragmented pieces of data on a hard drive (10 letters)
  6. 12. equipment connected to a computer (11 letters)
  7. 13. old hardware with newer versions (7 letters)
Down
  1. 1. program that protects against viruses (10 letters)
  2. 2. and instructions that run on a computer (7 letters)
  3. 5. software to the latest version (6 letters)
  4. 6. a system from unauthorized access (7 letters)
  5. 7. unwanted files and programs (8 letters)
  6. 8. of interconnected computers (7 letters)
  7. 10. scheduled backing up of data (6 letters)