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Windows Defender Antivirus. Keep your PC safe with trusted antivirus protection built-in to Windows 10. Windows Defender Antivirus delivers comprehensive, ongoing and real-time protection against software threats like viruses, malware and spyware across email, apps, the cloud and the web.
Windows Defender for Windows 8.1, Windows RT 8.1, and Windows 10 provides built-in protection against malware. You can't use Microsoft Security Essentials, but you don't need to—Windows Defender is already included and ready to go.
Before installing Microsoft Security Essentials, we recommend that you uninstall other antivirus software already running on your PC. Running more than one antivirus program at the same time can potentially cause conflicts that affect PC performance.
Windows comes with built-in antivirus software, but you can also try any of the Windows-compatible antivirus providers that are listed on this page.
Windows inbuilt Defender Antivirus is top of the notch antivirus. You don't require a third party antivirus now with Defender coming into picture. All top experts of Windows agree on this fact. This also gets regular and frequent updates on par with any other reputed antivirus.