Windows Security is built directly into Windows 10 and Windows 11. In 2026, Microsoft Defender has matured into a genuinely competitive antivirus solution that outperforms many paid products in both protection and usability tests.

Protection Performance

In AV-TEST’s 2026 evaluations, Microsoft Defender achieved 99.8% protection against zero-day threats with zero false positives — a perfect score placing it alongside Bitdefender and Kaspersky at the top of consumer antivirus rankings.

Built-in Features

• Real-time antivirus and anti-malware protection
• Ransomware protection (Controlled Folder Access)
• Firewall and network protection
• SmartScreen (browser and app protection)
• Device encryption (BitLocker on Pro+)
• Parental controls (Microsoft Family Safety)
• Performance and health reports
• Wi-Fi security recommendations

Microsoft Defender for Individuals

For $79.99/year, Microsoft Defender for Individuals adds identity theft monitoring, secure VPN (50GB/month), and cross-device protection.

Verdict

For most Windows users running Windows 11 with sensible browsing habits, Windows Security is sufficient. Its perfect protection scores and zero system overhead make it the best “set and forget” antivirus available.