Running virtual environments for various PC operating systems from Windows 7 – Windows 10, I not only looked at each antivirus’s malware protection capabilities, but also its user interface and its reputation for safeguarding user privacy. I tested every free antivirus I could find against thousands of old and new Windows malware files. Download Avira Free Security for Windows here.🥇 Avira: Excellent free antivirus protection that includes real-time malware scanning, a safe shopping extension, a privacy + performance optimizer, and a free VPN.Short on time? Here’s the best free Windows antivirus for 2021: