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Add an exclusion to Windows Security

To check if Windows Defender is blocking SigmaXL:

 Windows 10
  1. Click Start > Settings:
  2. Click Update & Security:
  3. Click Windows Security:
  4. Click Virus & threat protection


 Windows 11 Instructions
  1. Click Start > Settings:
  2. Click Privacy & security:




If Windows Security has incorrectly flagged SigmaXL as untrusted, you can prevent it from blocking it by adding the folder to the exclusions list. 

  1. Step One
  2. Step Two
  3. Step Three



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