5.2 Third-Party Antivirus

Microsoft Defender (built into Windows) is enough for many users. Third-party antivirus is optional—choose it if you need specific features, a different policy console, or a vendor’s support contract. Install only one real-time antivirus at a time; a second product often causes conflicts and slowdowns. Always download from the vendor’s official site, never from “cracked” bundles or unknown download hubs.

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  Kaspersky

  Long-standing vendor with strong independent test scores and a deep feature set (paid tiers add firewall extras, parental controls, VPN bundles, etc.).

  • Strengths: Generally excellent malware detection in lab reports; granular settings for advanced users.
  • Trade-offs: Full suites can feel heavy on older hardware; free options are limited. Some institutions publish guidance on supplier choice—read current policies if you work in government, defense, or regulated industries.
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  Huorong Security (火绒安全)

  Widely used in Chinese-speaking markets; known for a quiet experience—few pop-ups and relatively low resource use for everyday PCs.

  • Strengths: Lightweight feel; sensible defaults for blocking malicious ads and bundled installers; integrates cleanly with Windows Security status pages.
  • Trade-offs: Documentation and community support are weaker outside Chinese; enterprise dashboards are not its main focus compared with global EDR suites.
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  AVG

  Consumer antivirus from the same corporate family as Avast (Gen). Offers a free baseline with optional paid upgrades.

  • Strengths: Easy onboarding; acceptable protection in many tests; familiar UI for casual users.
  • Trade-offs: Free tier can show upgrade prompts and bundled offers—read each installer screen carefully.
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  Avast

  Very large user base; free antivirus plus paid security suites. Shares technology and ownership context with AVG.

  • Strengths: Solid mainstream detection; frequent updates; many online help articles.
  • Trade-offs: Aggressive marketing in free versions; privacy-conscious users should review data-sharing settings in the product and privacy policy.

Choosing and installing safely

• Prefer products reviewed regularly by independent labs (for example AV-TEST, AV-Comparatives) rather than brand hype alone.
• After installing a third-party AV, open Windows Security—Windows usually registers the new program as the active provider and adjusts Microsoft Defender automatically.
• Uninstall old security suites with the vendor’s removal tool if the normal uninstall leaves drivers behind.
• Avoid “optimizer / PC cleaner” bundles that promise impossible speed gains; they often add noise and risk.