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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 .
The first version of the antivirus program was basic, had no inbuilt update facility (updates had to be obtained from a BBS and manually installed by the user) and could scan for 1,234 different viruses. [3] Microsoft Anti-Virus for Windows (MWAV), included as part of the package, was a front end that allowed MSAV to run properly on Windows 3.1x.
Since its January 13, 2005, [2] Microsoft releases the updated tool every second Tuesday of every month (commonly called "Patch Tuesday") through Windows Update, at which point it runs once automatically in the background and reports if malicious software is found. The tool is also available as a standalone download.
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.
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.
System administrators can configure Windows Update to install critical updates for Microsoft Windows automatically, so long as the computer has an Internet connection. In Windows 10 and Windows 11, the use of Windows Update is mandatory, however, the software agreement states that users may stop receiving updates on their device by ...
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