In general, it is not easy to hacked on Windows for daily use. It seems to be a problem rather than a hack issue according to your description.
In my opinion, you could create a clean Windows 10 installation media from Microsoft website and use it to clean install. After clean install and activate, the block and permission issue should be fixed.
Download media creation tool here and use it to Create Windows 10 installation media
https://www.microsoft.com/en-us/software-download/windows10
Keep system is up to date and make sure Windows Defender running, it's enough to resist hack.
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