Roundup
Antivirus for Windows Compared: Suites, Free Tiers and Defender
Windows remains the platform most commodity malware is written for, which is why antivirus for PC is the highest-intent question in consumer security. It is also the platform with the strongest free baseline, because Microsoft Defender ships with the operating system.
This comparison is organised by the decision that actually matters on Windows: keep the built-in protection, add a free third-party engine, or buy a suite.
Comparison table
| Windows 11 support | All products listed | All products listed |
|---|---|---|
| Windows 10 support | All products listed | Verify end-of-support timelines with each vendor |
| Needs installation | No for Defender | Yes for every third-party product |
| Firewall | Windows Firewall built in | Third-party firewalls in Norton, Bitdefender paid, ESET Premium |
| Offline / pre-boot scan | Microsoft Defender Offline Scan | Rescue media in ESET, Panda, Kaspersky |
| Best for old hardware | ESET, Webroot, Defender | Avoid the heaviest all-in-one suites |
Windows virus protection you already have
Before installing anything, open Windows Security and check three things: real-time protection is on, cloud-delivered protection is on, and controlled folder access is enabled for your documents. Those settings cost nothing and close the most common ransomware path on a home PC.
When a third-party product is genuinely worth it
Buy a suite when you need cross-platform coverage, when you want a VPN and password manager on the same bill, when you manage other people's machines remotely, or when you want a vendor support line to call. Those are real reasons. 'Defender is not good enough' is, in 2026, mostly not one.
Verdict
For a single well-patched Windows 11 PC: Defender plus Malwarebytes free. For a household of mixed devices: Norton 360 Deluxe or Bitdefender Total Security. For an ageing laptop: ESET or Webroot.
Products in this comparison
Frequently asked questions
- What is the best anti virus for PC?
- For most home PCs, Microsoft Defender with the right settings, or Bitdefender if you want a third-party engine. 'Best' depends on your device count and feature needs more than on detection.
- Does Windows 11 need antivirus?
- Windows 11 already has antivirus — Microsoft Defender. The question is whether you want to replace or supplement it, not whether you have any protection.