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Microsoft Defender Antivirus (formerly Windows Defender) is an antivirus software component of Microsoft Windows. It was first released as a downloadable free anti-spyware program for Windows XP and was shipped with Windows Vista and Windows 7 .
Many antivirus products use "third-party antivirus engine". This means that the antivirus engine is made by another producer; however, the malware signature and/or other parts of the product may (or may not) be done from the owner of the product itself.
AV-Comparatives is an Austrian independent organization that tests and assesses antivirus software, regularly releasing charts and reports that are freely available to the public and the media. [1] [2] Antivirus vendors have to meet various requirements regarding trustworthiness and reliability in order to take part in the tests. [citation needed]
Prior to version 4.5, MSE ran on Windows XP, Windows Vista, and Windows 7, but not on Windows 8 and later versions, which have built-in AV components known as Windows Defender. MSE 4.5 and later versions do not run on Windows XP. The license agreement allows home users and small businesses to install and use the product free of charge.
Click Try it FREE for 30 days. Enter your billing information. Click Start My Free Trial. Navigate to your confirmation email and click Get Started Now. An email request will be sent to finish setting up your account. Navigate to that email and click the link provided. Create your account password and click Save.
As of Windows 8, Windows includes its own free antivirus protection under the Windows Defender brand. Despite bad detection scores in its early days, AV-Test now certifies Defender as one of its top products.