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Microsoft Windows Defender Update

Microsoft Windows Defender Definition Update September 25, 2021

Download the latest updates or definitions for your Microsoft Windows Defender security software. Learn what's new on this latest version. Click here if the download does not begin automatically.

While you download, you should know...

  • This download has been certified 100% clean. Tested in TechSpot labs using VirusTotal and Avira technology.
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More about Microsoft Windows Defender Update

This package will help you install the latest Windows Defender definition updates. Windows Defender is a free program that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software. It features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected and minimizes interruptions and helps you stay productive.

How to download and install a Microsoft Windows Defender update: Read more.

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