[Installation error: Norton detected. [MOVED]]

well according to me it seems to be a windows issue you can get the windows to reinstall if you can and do save out your data first. 

 

I guess that would resolve your problem.

 

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[WhatsApp Web not downloading images or audio with Safe Kids activated]

Well, I would recommend you to turn off the auto-download selection and always tick the option to ask before downloading will make sure that you would be always aware of what's downloading into your system.