What has caused brand new W11 machine to lose wifi connectivity?

[Andrew Clarke7]

Brand new Windows 11 MSI desktop included a trial version of Norton 360. Wifi has worked faultlessly from initial start-up, Windows registration etc., and has worked normally until, suddenly there is no wifi - it just shows my Internet provider, my account number and password with a comment 'No Internet, secured'. All my other devices, laptop, phone, smart tv all work normally. I have tried disabling Norton and done the restart and cold boot, but nothing works.I've taken screenshots, as advised in other threads here, and would be very grateful for some help here - my machine is not yet a month

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