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I didn’t only look at each antivirus’s malware protection capabilities, but also its reputation for safeguarding user privacy, its ability to integrate with recent versions of Windows, and its user interface.īut it’s important to keep in mind that every free antivirus has limitations. I tested heaps of free antiviruses against thousands of Windows malware files, both old and new.

Try Norton for Windows here (60 days risk-free).It’s not 100% free, but it has a 60-day money-back guarantee, which gives you 2 full months to see if it’s right for you. 🥇 Norton: Advanced virus and malware protection with extras like webcam protection, a VPN, a password manager, parental controls, dark web monitoring, and more.To do this, open Microsoft Security Essentials, click Update, and then examine the virus and spyware definitions status.Short on time? Here’s the best free Windows antivirus for 2023: After the file extraction dialog box closes, you can verify that the virus and spyware definitions were updated. The dialog box indicates that the definition update is installing. When the definition update file runs, a file extraction dialog box appears. If you are prompted for an administrator password or for confirmation, type the password, or click Continue. Right-click the file, and then click Run As Administrator. To install the saved file, follow these steps:ĭouble-click the file, and then click OK. If you click Save, remember the folder where you saved the file. Or, click Save to save the file to the computer. The 64-bit versions of Windows include 圆4-based versions of Windows.Ĭlick Run to install the definition update file immediately. Important: You must be running a 64-bit version of Windows to run a 64-bit version of Microsoft Security Essentials.