YDU Information Services

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Basic Security Protection

Computer Security Guidelines

  • Regularly back up important files.
  • Keep operating system and software up to date.
  • Use strong passwords and change them regularly.
  • Use licensed software and avoid untrusted sources.
  • Avoid using P2P software like FOXY or BT.
  • Install antivirus software and update virus definitions regularly.
  • Enable firewall protection.
  • Verify links from messaging apps before clicking.
  • Confirm website URLs to avoid phishing scams.
  • Avoid clicking on ads or untrusted websites.
  • Scan downloaded files for viruses before opening.
  • Properly use USB drives: scan before use, open in file explorer mode, and disable autorun.

System Checks
  • System runs unusually slow.
  • High CPU usage (>95%).
  • Frequent memory shortage messages.
  • Unexpected pop-up windows appear.
  • Some system programs fail to run.
  • Unknown files are generated.
  • Hidden files cannot be displayed.
  • Unknown processes running in Task Manager.
  • Computer automatically sends spam emails.
  • Unknown programs start on boot.
  • Unknown services start or system services are disabled.
  • Firewall cannot start or opens unknown ports.
  • Antivirus repeatedly reports blocked viruses.
  • Antivirus fails to start or shuts down automatically.
  • Virus definitions cannot update.
Network Checks
  • Unable to connect to network.
  • Network works but web pages cannot be accessed.
  • Slow network speed.
  • Continuous large upload/download when not in use.
  • Unknown network connections.
  • Cannot access antivirus or Windows Update websites.
  • Website redirects to incorrect page.

  • Ensure antivirus definitions are up-to-date; update from official site if necessary.
  • Disable "System Restore".
  • Boot into Safe Mode (do not enable network).
  • Clear browser and system caches.
  • Check startup items in registry and remove suspicious entries.
  • Run a full antivirus scan.