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If you’re running a supported version of Windows, you’ve already got Microsoft Defender Antivirus built in, helping to protect you against viruses, spyware, and other malware.

Malware consists of viruses, spyware and other potentially unwanted software. Microsoft Defender Antivirus is free and is included in Windows, always on and always working to protect your PC against malware.

Hackers and scammers sometimes use fake antimalware software to trick you into installing viruses or malware on your computer. Should you wish to explore alternatives to the already installed or available Microsoft antimalware software on your Windows PC, the reputable security companies listed below provide consumer security software that is compatible with Windows. Just click the company name to see the Windows-compatible product they offer.

For business security software that is compatible with Windows, please contact your security vendor of choice.

Many companies, including those listed on this page, distribute antimalware software. You should carefully investigate the source of antimalware and other products before downloading and installing them. 

To learn more about protecting your Windows device see Stay protected with Windows Security.

Important: Microsoft Defender Antivirus will turn off if you install another antimalware program to protect your PC. Before you install antimalware software, check to make sure you don't already have another 3rd party antimalware product on your computer. If you do, be sure to remove the product you don't want before you install the new one. It can cause problems on your computer to have two different antimalware products installed and running at the same time.

Note: The antivirus providers listed on this page might be unavailable for your version of Windows or in your country or region.

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