Antivirus for Windows 10 PCs
Windows 10 machines are often older hardware, so footprint matters more here than on a new Windows 11 laptop. The protection question is inseparable from the patching question.
Products covered on this page
Patch status comes first
If your Windows 10 installation no longer receives security updates, no antivirus makes it safe — unpatched OS vulnerabilities are exploited below the level a scanner can see. Confirm your update status before choosing a product.
Lightweight choices
Microsoft Defender, ESET and Webroot behave best on constrained hardware. Avoid all-in-one suites that bundle optimisation utilities and VPN clients on a 4 GB machine.
Frequently asked questions
- Is Windows Defender enough on Windows 10?
- On a fully updated Windows 10 machine with careful browsing habits, yes for most users.
- What is the lightest antivirus for an old PC?
- Webroot and ESET among paid products, or Microsoft Defender since it is already part of the system.