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Windows Defender

Protect your online activity from various threats in real time.

Stay protected from viruses, malware, and spyware with this built-in tool that your don't have to install or configure. Get real-time security to avoid online threats, such as web pages trying to make you download and install malicious programs or follow a harmful link intending to steal your banking or sensitive data.


  • Integrated in Windows
  • Lightweight
  • Forms an exclusion list of files
  • Schedules scanning


  • Detection can be erratic
  • Sometimes, it shows false positives
  • Developed by Microsoft
  • File name: mssstool32.exe (872 KB)
  • Latest version: 7.0
  • License: Free
  • Updated: July 18, 2021
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