Windows Security · 6 min read
Choosing the Best Antivirus for Windows 11
Windows 11 ships with more built-in security than any previous version: Defender, SmartScreen, memory integrity, virtualisation-based protections and a TPM requirement. Any antivirus decision starts from that baseline.
Published 2026-08-09 · Last updated 2026-08-09
Free routes that work well
Microsoft Defender with controlled folder access enabled is the zero-effort option. Bitdefender Antivirus Free Edition is the strongest third-party free engine with a quiet interface. Add the free Malwarebytes scanner to either for second opinions.
Paid options and who they suit
Bitdefender for detection with a light footprint. Norton 360 Deluxe when you want VPN, cloud backup and family coverage bundled. ESET when the machine is performance-sensitive. Trend Micro when phishing is your main exposure.
Windows 11 settings worth checking regardless
Core isolation and memory integrity under Device security. Controlled folder access under Ransomware protection. Reputation-based protection, which covers potentially unwanted app blocking. All three are free and take two minutes.
- Windows Security → Device security → Core isolation → Memory integrity
- Virus & threat protection → Ransomware protection → Controlled folder access
- App & browser control → Reputation-based protection → Potentially unwanted app blocking
Frequently asked questions
- Do I need to buy antivirus for Windows 11?
- No. Windows 11 includes real antivirus. Buy only if you want the extra features a suite bundles.
- What is the best free antivirus for Windows 11?
- Microsoft Defender for integration and silence; Bitdefender Antivirus Free Edition if you prefer a third-party engine.