Staying Safe on Windows 10 After 2025: Gizmodo’s Free Antivirus Picks Hold the Line

Microsoft ended support for Windows 10 on October 14, 2025. Security updates stopped. Patches dried up. The operating system that still powers millions of PCs entered its twilight with a target on its back. For users who refuse—or cannot afford—to move on, the question isn’t if they’ll get attacked, but when. Yet a new roundup from Gizmodo finds that a handful of free antivirus tools can still offer meaningful protection, even as the foundation beneath them crumbles. The publication singles out Microsoft Defender, Avira Free Antivirus, and Malwarebytes Free as the most viable shields for a zombie OS, at least through 2026.

Windows 10’s Final Curtain and the Security Void

Extended Security Updates (ESU) exist for businesses and deep-pocketed laggards, but they cost real money and only delay the inevitable. Consumer-level ESU plans are similarly priced, yet adoption remains low. That leaves ordinary users with a conundrum: run an unpatched, exposed machine or abandon perfectly functional hardware. Gizmodo’s analysis acknowledges this tension. The sites and services you visit, the files you download, the networks you connect to—all become vectors for exploits that will never get fixed. In this environment, traditional antivirus becomes less an optional luxury and more a critical last resort.

The real risk isn’t just old-school viruses. It’s ransomware, credential stealers, and drive-by downloads that prey on known vulnerabilities. Windows 10 will accumulate these holes indefinitely. A zero-day discovered in February 2026 will remain forever open on Windows 10. So any AV solution must compensate for an OS that can no longer defend itself at the kernel level.

The 2026 Antivirus Roundup: What Gizmodo Found

Gizmodo’s evaluation considered detection rates, system impact, update cadence, and usability. The three finalists—Microsoft Defender, Avira Free Antivirus, and Malwarebytes Free—all cleared the bar, but for different reasons and with different caveats.

Microsoft Defender: The Familiar Last Line

Built into Windows 10, Defender remains the most convenient option because it’s already there. Gizmodo confirms that Microsoft continued to push malware definition updates to Windows 10 machines well into 2026, despite the official end of support. That’s consistent with past practice: Redmond often maintains signature updates for legacy operating systems long after the last Patch Tuesday. However, the engine itself—the core scanning technology—won’t see feature upgrades. No behavioral analysis improvements, no machine learning model refreshes. Defender on Windows 10 is frozen in time, armed only with signature-based detection and whatever heuristics it had at cutoff.

For low-risk users who stick to mainstream sites and avoid dubious downloads, Defender’s real-time protection still catches a decent chunk of threats. Independent tests from late 2025 showed it blocking 99.5% of widespread malware samples. But that number will degrade as attackers craft exploits specifically for unpatched Windows 10 flaws. Defender can’t fix those flaws. It can only hope to stop the malicious payloads that try to exploit them.

Avira Free Antivirus: Lightweight and Cloud-Powered

Avira has long been a darling of the free antivirus scene, and its 2026 incarnation earns Gizmodo’s nod for its blend of low system impact and high detection rates. The installer bundles a few optional extras—a VPN trial, a system speed-up tool—but the core protection remains gratis. Avira leans heavily on cloud-based scanning, meaning the heavy lifting happens on remote servers rather than your local CPU. That keeps the footprint small, even on aging hardware, which matters enormously for Windows 10 diehards.

Crucially, Avira’s cloud engine continues to learn. Its detection models get updated in real time, independent of the local OS version. So while Windows 10 stagnates, Avira’s ability to spot zero-days and brand-new ransomware strains improves. Gizmodo highlights a test where Avira caught 100% of a live ransomware sample set released in early 2026. The trade-off: Avira’s free tier displays occasional ads, and some advanced features like web protection require a paid upgrade. But for pure antivirus, it delivers.

Malwarebytes Free: On-Demand Cleanup, Not Sentinel

Malwarebytes Free appears on the list with a big asterisk: it doesn’t provide real-time protection unless you pay. The free version is an on-demand scanner, designed to root out deeply embedded malware that traditional antivirus might miss. Gizmodo recommends it as a supplemental tool—run it weekly, or whenever something seems off. Its strength lies in aggressive heuristics that can rip out adware, browser hijackers, and rootkits, even after they’ve embedded themselves. For Windows 10 users who already have Defender or Avira running, adding Malwarebytes Free creates a layered defense without spending a dime.

One often-overlooked perk: Malwarebytes Free updates its scanning engine and signature database regardless of the OS’s support status. The company historically supports older Windows versions long after mainstream vendors abandon them. In a 2026 lab test, it removed 95% of prevalent malware and 100% of PUPs (potentially unwanted programs). That makes it an invaluable fallback when your main guard fails.

How These Tools Stack Up in a Post-Support World

Comparing them head-to-head reveals complementary strengths rather than a single winner. Defender integrates seamlessly and costs nothing beyond what you already paid years ago. Avira offers superior detection for new threats, but at the cost of occasional nags. Malwarebytes Free cleans up the mess when those two slip.

The table underlines a hard truth: no free AV on Windows 10 can stay truly current. Defender’s engine is frozen; Avira’s cloud models are not, but the local driver stack still runs on an unpatched kernel; Malwarebytes only acts after infection. Together, they form a tripwire, but each wire can snap.

The Limits of Free Protection

Antivirus can’t patch the OS. It can’t fix a vulnerable SMB protocol or a privilege-escalation bug in the graphics driver. On a supported system, AV is a layer in a defense-in-depth strategy. On Windows 10 after October 2025, AV becomes the only layer actively maintained. That’s like reinforcing a castle’s gate while the walls are crumbling. Attackers increasingly exploit OS-level flaws to disable or bypass AV altogether. Once they own the kernel, your antivirus is blind.

Gizmodo’s piece wisely warns that these tools should not give a false sense of security. The roundup exists because users need practical stopgaps, not because anyone recommends running an unsupported OS indefinitely. Even with these free antivirus programs, basic precautions become non-negotiable: never log into sensitive accounts, don’t do online banking, isolate the machine from your main network if possible, and use a modern browser that still receives updates (Chrome and Firefox will likely drop Windows 10 support eventually).

Expert Consensus: No Substitute for Upgrading

Security researchers interviewed by Gizmodo uniformly urge migration. One analyst compared using Windows 10 after ESU to “driving a car without airbags, wearing a helmet.” Another pointed out that compliance frameworks like PCI-DSS explicitly forbid unsupported operating systems, so any business still running Windows 10 in 2026 is gambling with fines and lawsuits.

The publication’s final takeaway: Microsoft Defender, Avira Free, and Malwarebytes Free are the best emergency supplies you can grab without a wallet. They’ll keep the average threat at bay through 2026, but they won’t stop a targeted attack that weaponizes a new Windows 10 vulnerability. For most, the real answer is Windows 11, a Chromebook, or a Linux switch. If you must stay, pair AV with extreme caution and a solid backup strategy.

Why This Matters Now More Than Ever

The Windows 10 installed base remains massive. Steam’s hardware survey in January 2026 showed 38% of users still on Windows 10, down only slightly from 42% a year prior. That’s millions of machines, many in homes and small businesses that can’t justify new hardware. Cybercriminals notice those numbers too. Malware-as-a-service gangs are already retooling their wares to prioritize Windows 10 exploits, knowing the patch gap makes them more effective. A free antivirus that updates its definitions daily becomes a critical barrier.

Moreover, the ESU program costs $61 per year for consumers, doubling each subsequent year. For a three-year stint, a user would fork over $61 + $122 + $244 = $427. That’s more than the price of a budget Windows 11 laptop. Free AV, combined with smart habits, slashes that cost to zero while providing overlapping protection that ESU alone doesn't—ESU patches don’t include new OS security features, just vulnerability fixes. You still need AV.

Final Recommendations

If you’re clinging to Windows 10 in 2026, Gizmodo’s picks give you a fighting chance. Start with Microsoft Defender because it’s already active. Add Avira Free Antivirus if you can tolerate a few ads and want the best detection rates money doesn’t have to buy. Install Malwarebytes Free and schedule a weekly scan. Keep all other software—browsers, Office, media players—updated, since those will get patches long after the OS itself is abandoned. And most importantly, start planning your exit. Free antivirus buys time, but it can’t buy safety forever.

Gizmodo’s roundup serves as both a practical guide and a wake-up call. The freebies work today, but each passing month erodes their effectiveness. The clock is ticking louder for Windows 10 holdouts.