To check if Windows Defender is blocking SigmaXL:
| Panel |
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| Expand |
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| title | Windows 11 Instructions |
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| - Click Start
 > Settings  : - Click Privacy & security
 :
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If Windows Security has incorrectly flagged SigmaXL as untrusted, you can prevent it from blocking it by adding the folder to the exclusions list.
| Panel |
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| Expand |
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| title | Windows 10 Instructions |
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| - Click Start > Settings:
- Click Update & Security:
- Click Windows Security:
- Click Virus & threat protection:
- Under Virus & threat protection settings, select Manage settings:
- Under Exclusions, select Add or remove exclusions:
Select Add an exclusion, and then select from files, folders, file types, or process. A folder exclusion will apply to all subfolders within the folder as well.
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Select Add an exclusion, and then select from files, folders, file types, or process. A folder exclusion will apply to all subfolders within the folder as well.
Step One- Step Two
- Step Three
