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Hi, today I wanted to scan my computer using Virus & threat protection app, unfortunately I couldn't access it because: 
I tried to google a fix for this but no option worked for me so far (concerning group policies).
Also many settings are disabled or hidden from me because:
I've tried changing in advanced system settings my computer into home network but everytime I've restarted my PC it just revert the changes.
Please help.
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Hi,
If your computer is domain joined, i would recommend you check all the group policies the computer had applied .
Run the CMD as administrator and type the command : gpresult /h report.html
Then you can see all the policies , then you can check if there are any polies related to the app restriction ,app locker .
Best Regards,
Sadly I couldn't find any fix because even though on update & security I could see what group policies have been turned on but it couldn't be turned off, because of that I had to reset my windows and now everything is fine
Firstly, good to hear that you have solved this issue by yourself and thanks for sharing here!
Then, for the group policies applied , if it was from the domain, we can't change it locally ,if it was set from local group policy, we can change it from the gpedit.msc if you are a local administrator group member.
If there is anything else we can do for you, please feel free to post here!
Best Regards,