1) Run the Norton uninstall tool to make sure that there are no remaining files:
https://support.norton.com/sp/en/us/home/current/solutions/v60392881
https://support.norton.com/sp/en/us/home/current/solutions/v15972972
2) Open administrative command prompt and type or copy and paste:
sfc /scannow
dism /online /cleanup-image /restorehealth
msdt.exe -id WindowsUpdateDiagnostic
3) Run the Windows firewall troubleshooter and Security troubleshooters:
4) If the above command prompt commands and Microsoft Windows troubleshooters fail to fix problems with Windows 11 then perform an in place upgrade repair:
https://www.elevenforum.com/t/repair-install-windows-11-with-an-in-place-upgrade.418/
https://www.elevenforum.com/t/download-official-windows-11-iso-file-from-microsoft.1009/
https://www.microsoft.com/software-download/windows11
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