Microsoft Defender Antivirus
Microsoft Defender is free, pre-installed, and has closed most of the gap with paid suites — a legitimate baseline for budget-conscious or minimalist users.
Microsoft Defender's detection has improved substantially in recent years, now scoring within a few points of several paid suites in independent lab tests.
Being built directly into Windows, it has the lowest possible overhead of anything in this list, with no separate background service to manage.
Coverage is genuinely solid for core protection — ransomware folder controls, SmartScreen, and cloud-delivered updates — but there's no VPN or password manager.
It's free and already installed — there's no purchase decision to make, which is exactly the point for minimalist or budget setups.
Windows Security's interface is plain but functional, tucked into Settings rather than a standalone app, with fewer configuration options than dedicated suites.
How to Get the Most From Microsoft Defender
Who can rely on it
Microsoft Defender is enough for many Windows users who keep their system updated, use a password manager and are careful with downloads and links. It runs in the background from the first boot, updates through Windows Update and needs no subscription.
It is less ideal for families who want parental controls in one place, users who want a bundled VPN or people who often install software from unofficial sources.
Settings worth turning on
Some useful protections are switched off by default or easy to miss, so open Windows Security and check them.
Controlled Folder Access stops unknown apps from changing files in Documents, Pictures and other protected folders. It is one of the most effective free defenses against ransomware, though you may need to allow some trusted apps manually.
Reputation-based protection can block potentially unwanted apps that come bundled with free software. SmartScreen checks sites and downloads against Microsoft's reputation data and warns you before you open something risky.
If you suspect an infection, run a Microsoft Defender Offline scan. It restarts the PC and scans before Windows loads, which helps against malware that hides while the system is running.
Where it falls short
Defender's web protection works best in Microsoft Edge. In Chrome or Firefox you rely more on the browser's own safe browsing features. There is no VPN, password manager or identity monitoring, and parental controls live in the separate Microsoft Family Safety app.
Support is limited to documentation and community forums, so you solve most issues on your own. For a household that wants one dashboard and a support line to call, a paid suite is easier.
A note for Windows 10 users
If you still use Windows 10, Defender may keep receiving threat definitions, but the operating system itself no longer gets free security fixes for most users. Upgrading to Windows 11, where your hardware allows it, protects you more than any antivirus can.
Final verdict
Defender is a legitimate baseline in 2026. Turn on the extra protections above and add a third-party product only when you need features it does not offer.
