This is good news for those who found the annual renewal costs of paid antivirus software, which comes bundled with a computer purchase, burdensome. Nowadays, there are several reliable free antivirus programs available that you can use without paying any money.
1. Microsoft Defender (Windows built-in)
Microsoft Defender Antivirus is already pre-installed on Windows 10 and 11 and turns on without requiring a separate installation. In independent testing, its detection rates have risen to a level comparable to paid products, earning it the reputation of being the "lightest option with nothing to install." It runs quietly in the background without any advertisements or upgrade prompts.
2. Avast Free Antivirus
It is a leading free antivirus that still offers a free version as of 2026. Its free build received a perfect score from AV-TEST, and it also provides additional features such as ransomware blocking and Wi-Fi security scanning for free. However, you should be aware that notifications prompting upgrades appear frequently.
3. Malwarebytes Free (Supplemental)
Since it uses a "scan on demand" method rather than continuous monitoring, it is better suited as a supplementary antivirus to be used with Defender rather than as a standalone product. It excels at removing malware that has already infected the system.
Note: Even if advertised as free, it may actually be a "free trial version," so be sure to check the official website to download the 'Free' version. Also, it is most important not to rely solely on antivirus software, but to keep Windows updates and your browser up to date.
Source: Gizmodo "Best Free Antivirus for Windows 2026" (https://gizmodo.com/best-antivirus/free/windows), All About Cookies "Microsoft Defender vs. Avast 2026" (http://allaboutcookies.org/microsoft-defender-antivirus-vs-avast)
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