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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.
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.
Tech expert Kurt “CyberGuy" Knutsson says a tech support scam used a fake Windows Defender pop-up, tricking the victim to call and download software.
SmartScreen (officially called Windows SmartScreen, Windows Defender SmartScreen and SmartScreen Filter in different places) is a cloud-based anti-phishing and anti-malware component included in several Microsoft products: All versions of the Microsoft Windows operating system since Windows 8; Web browsers Internet Explorer and Microsoft Edge
Starting with Windows 10 Creators Update, Microsoft has introduced a new component called Windows Defender Security Center (WDSC) that provides much of the same functionality. This new component is a Universal Windows Platform app and is also the default front-end for Windows Defender.
The term "on-demand scan" refers to the possibility of performing a manual scan (by the user) on the entire computer/device, while "on-access scan" refers to the ability of a product to automatically scan every file at its creation or subsequent modification.