Do You Need to Buy Antivirus? Windows Security and Microsoft Defender Explained

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About Course

Many people pay every year for antivirus software without knowing that Windows already includes protection. This course explains Microsoft Defender Antivirus and the Windows Security app, how to check your computer is protected, how to run a scan, why you should not run two antivirus programs at once, and how to spot scary “your computer is infected” scams.

This course gives general guidance for Windows home users. It does not recommend any particular product. Tutwoo is not connected with Microsoft.

© 2026 Tutwoo UK Limited. This course was created in-house by Tutwoo and is our original work. It is for your own learning only: please do not copy, share, record or resell it.

What Will You Learn?

  • Understand that Windows 10 and 11 include Microsoft Defender Antivirus
  • Open Windows Security and check that protection is switched on
  • Run a quick or full scan when you are worried
  • Avoid running two antivirus programs at once, and avoid fake security warnings

Course Content

Course Lessons

  • What Windows already includes
  • Checking your protection and running a scan
  • One antivirus at a time, and fake warnings

Sources & Further Reading
The official guidance this course is based on.

Final Assessment

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